MgZn2 Phase Research Articles

Microstructure evolution and enhanced mechanical properties of additive manufacturing Al-Zn-Mg-Li alloy via forging and aging treatment

Porosity defects are difficult to overcome in Al-Zn-Mg-Li alloys, despite their high potential for application in the military and aerospace industries. Multidirectional forging and aging treatment were applied to tune the microstructure and mechanical properties of wire arc additive manufacturing Al-Zn-Mg-Li alloy. The grains were elongated along the forging direction attributed to the severe extrusion stress, accompanied by a great density of equiaxed recrystallized grains. As the forging reduction expanded from 30% to 50%, the average grain size was evidently reduced from 23.1 μm to 16.9 μm. A considerable number of porosities were heat-welded during the forging deformation process. The Al2CuMg, Al7Cu2Fe, and Al5CuLi3 phases were severely fragmented and agglomerated in the form of condensed clusters. Furthermore, numerous needle-shaped Al3(Li, Mg) phases were stochastically distributed. As the forging reduction increased from 30% to 50% and the aging temperature/time increased (from 140 °C/5 h to 170 °C/10 h), the rod like η′-MgZn2 phase was obviously coarsened, which considerably deteriorated the properties. The ultimate tensile strength was dramatically increased from 386 MPa to 473 MPa when comparing the specimens with 30% and 50% forging reduction. Both the yield strength and hardness exhibited a similar trend. The elongation was greatly enhanced with a higher forging reduction. Ultimately, the aging behavior was thoroughly investigated and the relationship between the strength η′-phase and yield strength was theoretically discussed.

Effect of Cu on the Microstructure of Al-8Zn-2.5Mg-xCu Alloys Fabricated by Twin roll casting

The effect of Cu content on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-xCu (x: 0, 1, 2, 3) aluminum alloys manufactured by the twin-roll casting process was investigated. The Al-8.0Zn-2.5Mg-xCu alloy showed an increase in surface defects with increasing Cu content. This is because the amount of residual liquid in the final solidification region increased from 9.6 wt.% to 18.3 wt.% as the Cu content increased from 0Cu to 3 Cu alloy. For the 3Cu alloy, as the amount of residual liquid in the final solidification region exceeded the critical point, a large number of surface defects and internal shrinkage defect were observed. The main secondary phases of the four alloys were the T(Mg32(Al, Zn)49) and η(MgZn2) phases, and their fraction increased with Cu content. These secondary phases mainly existed in the center segregation band, and a fine η(MgZn2) phase was additionally observed. In terms of mechanical properties, as the Cu content increased, the hardness of the center matrix, secondary phase, and overall hardness increased respectively. Although the yield strength increased, the tensile strength and elongation decreased because the center segregation band was widened from 684 μm to 790 μm with increasing Cu content.

Effect of trace copper on the microstructure, corrosion behavior and biological properties of biodegradable Mg–2Zn-1Gd-0.5Zr alloy

The biodegradable Mg–2Zn-1Gd-0.5Zr-xCu (x = 0, 0.1, 0.3, 0.5 wt.%) alloys are prepared to evaluate their microstructures, corrosion behavior, biocompatibility and antimicrobial properties. When the Cu element adds to the alloys, the new MgZnCu phase generates in the alloys in addition to the MgZn2 phase, W–Mg3Gd2Zn3 phase and I–Mg3Gd6Zn phase. With the Cu content increases, the grains become finer. Meanwhile, the shape of the MgZnCu phase transforms from spherical and elongated into the reticular. The grain boundary, the reticular W–Mg3Gd2Zn3 phase and the MgZnCu phase act as physical barriers to hinder the spread of corrosion. The generation of Ca–P compounds and the formation of dense oxides further improve the corrosion resistance of the alloys. Meanwhile, an increase in the content of the second phase and a change in the morphology of the MgZnCu phase also enhance galvanic corrosion, which reduces the corrosion resistance of the alloys. The corrosion rate of the Mg–2Zn-1Gd-0.5Zr-0.1Cu alloy is 0.47 ± 0.05 mm/year, and its degradation rate is much lower than that of the other Cu-containing alloys. Mg–2Zn-1Gd-0.5Zr-0.1Cu alloy has no cytotoxicity to MC3T3-E1 in the biocompatibility tests and shows good antibacterial properties in the antimicrobial experiments. In general, the Mg–2Zn-1Gd-0.5Zr-0.1Cu alloy is considered as the potential biodegradable antimicrobial biomaterial for bone implants.

Soft Alloys Constructed with Distinct Mesoatoms via Self-Sorting Assembly of Giant Shape Amphiphiles.

The packing structures of spherical motifs affect the properties of resultant condensed materials such as in metal alloys. Inspired by the classic metallurgy, developing complex alloy-like packing phases in soft matter (also called "soft alloys") is promising for the next-generation superlattice engineering. Nevertheless, the formation of many alloy-like phases in single-component soft matter is usually thermodynamically unfavourable and technically challenging. Here, we utilize a novel self-sorting assembly approach to tackle this challenge in binary blends of soft matter. Two types of giant shape amphiphiles self-sort to form their discrete spherical motifs, which further simultaneously pack into alloy-like phases. Three unconventional spherical packing phases have been observed in these binary systems, including MgZn2 , NaZn13 , and CaCu5 phases. It's the first time that the CaCu5 phase is experimentally observed in soft matter. This work demonstrates a general approach to constructing unconventional spherical packing phases and other complex superlattices in soft matter.

Soft Alloys Constructed with Distinct Mesoatoms via Self‐Sorting Assembly of Giant Shape Amphiphiles

AbstractThe packing structures of spherical motifs affect the properties of resultant condensed materials such as in metal alloys. Inspired by the classic metallurgy, developing complex alloy‐like packing phases in soft matter (also called “soft alloys”) is promising for the next‐generation superlattice engineering. Nevertheless, the formation of many alloy‐like phases in single‐component soft matter is usually thermodynamically unfavourable and technically challenging. Here, we utilize a novel self‐sorting assembly approach to tackle this challenge in binary blends of soft matter. Two types of giant shape amphiphiles self‐sort to form their discrete spherical motifs, which further simultaneously pack into alloy‐like phases. Three unconventional spherical packing phases have been observed in these binary systems, including MgZn2, NaZn13, and CaCu5 phases. It's the first time that the CaCu5 phase is experimentally observed in soft matter. This work demonstrates a general approach to constructing unconventional spherical packing phases and other complex superlattices in soft matter.

Research on design and microstructure of hot-dip Zn-Al-Mg/Sn alloy

In this paper, based on the effect of different intermetallic compounds on liquid metal induced embrittlement (LMIE) and corrosion resistance of GI coating during hot-forming process, a low-aluminum, low-magnesium Zn-Al-Mg alloy with high corrosion resistance is designed by CALPHAD method. The equilibrium phase diagram and solidification path of Zn-Al-Mg(-Sn) zinc-rich corner are calculated, and the phase composition of the alloy is predicted and verified by experiments. The results show that the calculation results based on the CALPHAD method are highly reliable and can provide guidance for material design. The Mg-Zn phase in the melted Zn-Al-Mg alloy is Mg2Zn11, which is different from the MgZn2 phase in the traditional industrial field. This difference may be attributed to the difference of alloy element content and cooling rate. After the Sn is added on the basis of Zn-Al-Mg, hcp-Zn phase is initially precipitated in the alloy, then fcc-Al and Mg2Zn11 phases are precipitated at the same time, and then hcp-Zn + fcc-Al + Mg2Zn11 + Mg2Sn phase coexists. Finally, the phase is transformed into hcp-Zn + fcc-Al + Mg2Sn ternary eutectic. In addition, the corrosion resistance of the designed alloy shows that the Mg2Zn11 phase in eutectic structure can improve the corrosion resistance, while the improvement of the corrosion resistance of Mg2Sn is weaker than the Mg2Zn11 phase.

Effects of electromagnetic frequency on the microstructure and mechanical properties of Al70Zn10Mg10Cu5Si5 medium entropy alloy

In this work, an Al70Zn10Mg10Cu5Si5 medium entropy alloy was for the first time prepared by electromagnetic stirring casting. Electromagnetic casting has little effect on the generated phases in the as-cast alloys, and these phases are mainly composed of the α-Al solid solution, Mg2Si phase, Al2Cu phase, and MgZn2 phase. However, the electromagnetic frequency significantly affects the second phase's content, distribution, and morphology, especially for the Mg2Si phase, whose average particle size decreases from 40.0 to 17.7 μm. In addition, the compression mechanical properties were tested at room temperature, and it was found that the hardness, strength, and plasticity were effectively improved by applying a specific electromagnetic frequency. The optimal electromagnetic frequency was 20Hz in this work, under which the corresponding Vickers hardness, ultimate compressive strength δbc, and compressive yield strength δsc were 177 HV, 554 MPa, and 500 MPa, respectively. Moreover, mechanisms on the enhanced mechanical properties for the alloy fabricated with a proper electromagnetic frequency were systematically discussed. This first exploratory study can provide a reference for preparing Al-based medium entropy alloys by electromagnetic stirring casting.

Microstructures and tensile properties of Mg-2Zn-0.8Sr-0.2Ca alloy extruded at relatively slow speed and low temperature

In this work, a new Mg-2Zn-0.8Sr-0.2Ca alloy with low content of alloying elements was subjected to extrusion at relatively low-temperatures (240 and 200?C) and slow-speed (1.0 mm/s and 0.1 mm/s). The average size and volume fraction of recrystallized grains in the extruded Mg-2Zn-0.8Sr-0.2Ca alloy gradually decreased with the reduction in extrusion rate or extrusion temperature. Some broken second phases including Ca2Mg6Zn3 and Mg17Sr2 appeared in the extruded Mg-2Zn- 0.8Sr-0.2Ca alloy along with some precipitated nano-sized MgZn2 phases. The volume fraction of MgZn2 phases gradually in the alloy increased as extrusion rate or temperature decreased. High performance with yield strength of 393.1 MPa, ultimate tensile strength of 418.4 MPa and the elongation of 5.7% was obtained in the Mg-2Zn-0.8Sr-0.2Ca alloy extruded at 200?C & 0.1 mm/s. The main strengthening mechanisms could be attributed to grain-boundary strengthening, dislocation strengthening, precipitation strengthening, which were related to the change in grain size, second phases and basal texture intensity for the extruded Mg-2Zn-0.8Sr-0.2Ca alloy.

Effect of heat treatment and extrusion processing on the microstructure and mechanical properties of spray formed 7055 alloy

The effect of extrusion and heat treatment processes on the microstructure and mechanical properties of the spray formed 7055 alloy were systematically studied by three-dimensional X-ray microscope, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, atom probe tomography and tensile testing. It was found that the main second-phases in the as-deposited 7055 alloy include θ (Al2Cu) and Mg(Zn,Al,Cu)2 phases with similar structure to the ƞ (MgZn2) phase dissolved with Al and Cu. The Al2Cu particles embedded in Mg(Zn,Al,Cu)2 phase are widely distributed on the grain boundaries. Compared with the as-cast 7055 alloy, the S (Al2CuMg) phase and T (Al2Mg3Zn3) phases were not detected in the as-deposited alloy due to the change of solidification paths caused by rapid solidification. The microporosity caused by spray forming is always observed in the as-deposited alloy, these micro-pores can be effectively eliminated by the extrusion processing. Meanwhile, compared with extrusion directly after preheating at 420 °C/24 h, additional high temperature two-stage homogenization treatment before extrusion can reduce the adverse effect of S (Al2CuMg) phase and promote the precipitation of high density of Al3Zr dispersoids, which significantly increases the recrystallization resistance and improve the mechanical properties of the alloy.

Influence of the Zr content on the processability of a high strength Al-Zn-Mg-Cu-Zr alloy by laser powder bed fusion

The objective of this research is to study the effect of the Zr on the L-PBF processability, microstructure, and microhardness of an AlZnMgCu-Zr alloy. Two AlZnMgCu-0.5 and 1.5 wt% Zr pre-alloyed powders were produced by casting followed by gas atomization. In addition, an excess of Mg and Zn was added to the target compositions to compensate for vaporization during L-PBF. The as-atomized powders and the as-built and heat treated specimens were characterized via scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. Crack-free samples with a relative density of 99.0 ± 0.1% were obtained in the alloy containing 1.5 wt%Zr. The as-built microstructure of this alloy consisted of small equiaxed grains without preferred grain orientation near the melt pool boundary and slightly columnar grains between adjacent melt pools. After a solution and aging heat treatment (T6), the newly developed AlZnMgCu-1.5Zr alloy has an outstanding Vickers micro-hardness of 223 ± 3 HV, which is significantly higher than that of the wrought Al7075-T6 aluminum alloy. This excellent mechanical behavior is attributed to the presence of large Al3Zr nucleant particles of up to 500 nm in size that inhibit grain growth during solidification and the subsequent heat treatment, and of a high density of nanoscale second phases (MgZn2 and Al3Zr) located within the aged α-Al grains.

Microstructure and Wear Properties of Al 7075 Alloy Manufactured by Twin-Roll Strip Casting Process

Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative material. Based on initial microstructure observations, the Al 7075 alloy manufactured by the DC process showed relatively elongated grains compared to the Al 7075 alloy by TRC process. In both alloys, η(MgZn2) phases were present at the grain and grain boundaries. In the Al 7075 alloy manufactured by the DC process, the η(MgZn2) phases were coarse with a size of ~86 nm and were mainly concentrated in the local area. However, the Al 7075 alloy manufactured by TRC had relatively fine η(MgZn2) phases size of ~40 nm, and they were evenly distributed throughout the matrix. When the mechanical properties of the two alloys were compared, the TRC process showed higher hardness and strength properties than the DC process. In room temperature wear test results, the TRC process exhibited lower weight loss and wear rates compared to the DC process at all wear loads. In other words, the TRC process resulted in relatively superior wear resistance properties compared to the conventional DC process. The wear behavior of both alloys changed from abrasive wear to adhesive wear as the wear load increased. However, the TRC process maintained abrasive wear up to higher loads. Based on the above results, a correlation between the microstructure and wear mechanism of the Al 7075 alloy manufactured by TRC is also suggested.

Microstructure evolution of laser powder bed fusion ZK60 Mg alloy after different heat treatment

The laser powder bed fusion (LPBF) was employed to process the ZK60 Mg alloy. The effect of heat treatment on the microstructure and hardness of LPBF ZK60 Mg alloy was investigated. The results showed that the grain boundary of LPBF ZK60 Mg alloy was composed of a network Mg7Zn3 phase. Three types of precipitated phases were distributed inside the grains: the type-Ⅰ is Zn-rich precipitated phase with Zr-rich core, the type-Ⅱ is Zn-rich precipitated phase without Zr, the type-Ⅲ is Zr-rich particle. When the solution treatment was used, the Mg7Zn3 phase at the grain boundary melted and merged into the matrix. The precipitated phase in the grain mainly evolved into Zn-rich phase with Zn2Zr core. Continue with the aging heat treatment, the rod-shaped β1′-MgZn precipitated phase separated out from the α-Mg matrix. The length of the rod-shaped precipitated phase undergone double aging is longer and the quantity is more than that of the single aging. The rod-shaped β1′-MgZn precipitated phase significantly improved the mechanical properties of LPBF ZK60 Mg alloy. The average hardness increased from 0.88 ± 0.025 GPa to 1.01 ± 0.010 GPa and the ultimate tensile strength increased to 287 ± 4 MPa after the solution treatment plus double aging heat treatment.

Enhancing mechanical properties and corrosion resistance of a high strength 7A99 Al alloy by introducing pre-rolling in solution and aging treatments

The balance between the mechanical properties and corrosion resistance of high strength 7xxx Al alloys is an important topic. This study introduced pre-rolling into the solution and aging treatments for a recently developed 7A99 Al. The cold rolling after solution but before aging was considered as the first group, and the cold rolling before solution was the second group. For the first group, a great deal of strain energy was stored in the alloy, which contributed the occurrence of recrystallization during subsequent solution process and a finer grain structure. For the second group, the dislocations induced by cold rolling before aging accelerated the coarsening of η' and η precipitates. Moreover, T76 aging also caused the larger size of precipitates due to its higher temperature than T6 aging. The pitting corrosion of 7A99 Al tended to initiate at Al7Cu2Fe intermetallic, and the dissolution of MgZn2 phase along grain boundaries facilitated the intergranular corrosion. The cold rolling after solution process and T76 treatment both improved the resistance on stress corrosion cracking, since the grain boundary precipitates had large size, discontinuous distribution and high Cu content. The combining of cold rolling before solution and T6 treatment contributed to the enhancement of strength due to the fine grain strengthening, solution strengthening and precipitates strengthening, and the corresponding yield strength and ultimate tensile strength reached as high as 628 and 665 MPa. Compared to T6 treatment, the strength of T76 treated samples was reduced only by 3–5%, which is an advantage of the proposed method.

Work hardening and softening behavior of Mg–Zn–Ca alloy influenced by deformable Ti particles

Pure titanium particles reinforced Mg–6Zn-0.2Ca magnesium matrix composites were fabricated by semi-solid stirring casting followed by hot extrusion in this work. The microstructures and mechanical properties of the Mg–6Zn-0.2Ca alloy and its composites were studied. The Ti particles in as-extruded composites are significantly elongated along the extrusion direction. The average aspect ratio of Ti particles increases while the average size decreases, with the extrusion temperature decreasing. Ti particles promote the dynamic recrystallization of the matrix alloy, break the long-strip Ca2Mg6Zn3 phases and refine the size of MgZn2 phases in the Mg–6Zn-0.2Ca matrix, especially for low extrusion temperatures. The Tip/Mg–6Zn-0.2Ca composite extruded at 240 °C exhibited a high yield strength (YS) of 383.6 MPa with an ultimate tensile strength (UTS) of 404.8 MPa and a decent elongation to failure (EL) of 4.8%. The high strength is associated with fine grains, nano-precipitates as well as Ti particles. In addition, the work hardening rate of Tip/Mg–6Zn-0.2Ca composite is higher than that of Mg–6Zn-0.2Ca alloy at the early stage of plastic deformation due to the combined effects of the elongated Ti particles, the grain refinement and nano-scale MgZn2 precipitates. However, the work hardening rate of the composite decreases faster owing to dislocations cross-slip. And the composite is easier to soften, which results from grain boundary sliding of fine grains and work hardening of deformable Ti particles.

The Pilling-Bedworth Ratio of Oxides Formed From the Precipitated Phases in Magnesium Alloys

The Pilling-Bedworth ratio of oxides preferentially formed from the precipitated phases in magnesium alloys were calculated. The results showed that the PBR value of Nd2O3 preferentially formed from Mg12Nd was 1.0584, and the PBR value of Y2O3 preferentially formed from Mg24Y5 was 1.1923. Both the Nd2O3 and Y2O3 would provide a good protection to the Mg matrix. The Gd2O3 preferentially formed from Mg3Gd, whereas the MgO preferentially formed from MgNi2. The PBR value of these two oxides were both larger than 2. The corresponding oxides formed from the common precipitated phases Mg17Al12, MgZn2, MgCu2, Mg2Ca, Mg12Ce, and MgAg were all less than 1. The oxide films formed on surfaces of pure Mg and Mg-xY (x = 3, 5, 7 wt.%) alloys at high temperatures were analyzed. The results showed that the oxide films were composed of a Y2O3/MgO outer layer and an inner layer rich with Y2O3. The formation of Y2O3 was mainly caused by the oxidation of Mg24Y5. The more Y2O3 existed in the composite oxidation film, the better corrosion resistance of the Mg-Y samples.

Modification and verification of Miedema model for predicating thermodynamic properties of binary precipitates in multi-element alloys

At present, there is still a certain difference between the calculated and experimental results of the original Miedema formation enthalpy model. Therefore, it is necessary to improve the calculation accuracy of the Miedema model to facilitate the development of the Miedema model and its application in alloy design. To address the problem, a new atomic size factor is introduced to modify the Miedema model in this paper. Then, the accuracy of the modified Miedema model is verified. Firstly, the formation enthalpies of various magnesium-based binary alloys are recalculated using the modified Miedema model. Secondly, the precipitation temperature of MgZn phase in Mg–6Zn-0.6Zr ternary alloy is predicted using the modified Miedema model combined with Chou model, which is compared with the experimental result. Thirdly, the precipitation of binary phases in Mg–Zn–Zr–Y quaternary alloy is analyzed by calculation based on the modified Miedema model. The final results show that the calculated results obtained from the modified Miedema model are in good agreement with the reported results, experimental results and phase diagram results, indicating that the modification is reasonable.

Dynamic compression behaviour and microstructure of ZK60 alloy under different strain rates

In this study, the split Hopkinson pressure bar was used to investigate the effect of ageing treatment on dynamic compression properties and microstructure of extruded ZK60 alloy under different strain rates. The experimental results demonstrated that the amount of the precipitated MgZn and MgZn2 phases increases after ageing treatment. The peak flow stress increases with increasing strain rate. Due to ageing precipitation strengthening, the dynamic compressive strength of the ZK60 alloy is improved. EBSD and TEM results indicated that the dynamic compression deformation mechanism of the ZK60 alloy is the interaction of twins, dislocations, and dynamic recrystallisation. Furthermore, the extension twinning boundaries and the precipitated phases hinder the slip of dislocations during deformation, which significantly affects dislocation strengthening.

Research on Microstructure and Corrosion Behavior of Zinc-Magnesium Coating by Powder Impregnation

In order to improve the service life of railway fasteners under various environmental conditions, the Zn and Zn-Mg coating were prepared on the railway fastener gaskets by powder impregnation. XRD and SEM were used to characterize the phase composition, microstructure and morphology before and after the salt spray. The neutral salt spray test (NSST) and the electrochemical workstation were used to characterize the corrosion resistance of the two coatings. Results show that there was a large area of red rust on Zn coating after 480 hours of NSST, while there was no red rust on Zn-Mg coating after 1920 hours of NSST. The impedance of the Zn-Mg coating reached 1015.6 Ω·cm2, about 3.65 times of the Zn coating. Zn-Mg coating’ current density was 3.27 μA·cm−2, which was only 21% of the Zn coating. MgZn2 and Mg2Zn11 phases were easier to formed in Zn-Mg coating due to the infiltration of magnesium, forming a dense and protective layer, thereby greatly improved its corrosion resistance.

Corrosion behaviour of hot-dip Zn-Al-Mg coatings with different Al content

PurposeThe purpose of the present study is to simulate the industrial hot-dip process of Zn-2.5Wt.%Mg-3 Wt.%Al and Zn-2.5 Wt.%Mg-9 Wt.%Al-0.15 Wt.%Si coatings and to study the effect of low and high Al variation on their microstructure, microhardness, adhesion and corrosion behaviour.Design/methodology/approachThe hot-dip Zn-2.5 Mg-xAl coating simulation on steel substrate was carried out using a hot-dip process simulator. The microstructure of the coatings was characterized using a scanning electron microscope, energy dispersive spectroscopy and X-ray diffraction. The corrosion behaviour of the coatings was studied using a salt spray test in 5% NaCl solution as well as dynamic polarization in 3.5% NaCl solution.FindingsMicrohardness of the developed Zn-2.5 Mg-xAl coatings has been found to be approximately two times higher than that of the conventional galvanized coating. Zn-2.5 Mg-3Al coating has exhibited two times higher corrosion resistance as compared to that of Zn-2.5 Mg-9Al-0.15Si coating because of formation of more homogeneous and defect-free microstructure of the former. The MgZn2 phase has undergone preferential dissolution and provided Mg2+ ions to form a protective film.Originality/valueThe relative corrosion resistance of the two Zn–Al–Mg coatings with different Al content has been studied. The defect formed because of higher Al addition in the coating has been detected, and its effect on corrosion behaviour has been analysed.

Effect of zinc (Zn) on the microstructure and corrosion behaviour of magnesium (Mg)

In this study, Mg-Zn alloys were prepared by using powder metallurgy technique where magnesium (Mg) and zinc (Zn) were regarded as the starting materials. The effect of Zn towards the microstructure and corrosion behaviour of Mg was studied. The microstructure observation, intermetallic particle distribution, density and X-ray diffraction (XRD) analysis were measured and studied. Besides, the corrosion behaviour of Mg-Zn alloys was observed from hydrogen evolution test and potentiodynamic polarization test. The results showed that due to the same crystal structure of Mg and Zn which was hexagonal close packed (HCP) structure, MgZn2 was formed and complete solid solubility was achieved. The presence of α-Mg and MgZn2 phases was confirmed from the XRD result. The density of the Mg-Zn alloys was increased as the Zn content increased. From the results, Mg-30Zn has the highest value of density compared to Mg-10Zn and Mg-20Zn due to the Zn particles which filled in the gap between the Mg particles. The corrosion test for Mg-Zn alloys showed that Zn addition does improve the corrosion resistance of Mg alloys.