Influence of Zn and Y on Hot Compression Behavior of Mg-Li-Zn-Y Alloy

The effect of whisker misalignment on the hot compressive deformation behavior of SiCw/6061 Al composites at 500 °C

Effects of large amounts of Mg (5–13 wt%) on hot compressive deformation behavior and processing maps of Al-Mg alloys

Effect of Ca and CaO on the microstructure and hot compressive deformation behavior of Mg–9.5Zn–2.0Y alloy

Hot compression behavior and deformation mechanism of a high W content Ni-W-based superalloy at homogenized state

Role of Ca in hot compression behavior and microstructural stability of AlMg5 alloy during homogenization

A hot compression test was conducted across a range of temperatures (350, 400, 450, and 500 °C) and varying strain rates (0.001-10 s-1) to explore the hot compression behavior of the 6063 alloy. Hot processing maps were obtained based on the stress-strain curves. Optimal processing parameters were identified as residing within the intervals of (470-500 °C, 0.01-0.1108 s-1), achieving a maximum dissipation efficiency of 0.4, which is of great importance for perfecting hot processing. The microstructure evolution was characterized using an optical microscope and a transmission electron microscope. The initial grains were elongated under compressive deformation, and the density of dislocation rose with increasing strain rate and decreasing temperature. Dynamic recovery serves as the main dynamic softening mechanism during hot compression.

Effect of different crystalline directions on the mechanical properties and processing maps of Zr-Nb alloy for orthopedic applications.

Effects of second phases on deformation behavior and dynamic recrystallization of as-cast Mg-4.3Li-4.1Zn-1.4Y alloy during hot compression

Hot deformation and dynamic recrystallization behavior of TiAl-based alloy

The hot compressive behavior and processing maps of as-cast and extruded 7075 aluminum alloys with a similar grain size (320–350 μm) were studied and compared, which allows us to directly observe the effect of segregated phases in the as-cast microstructure on the deformation behavior and hot workability of 7075 alloys. In the as-cast alloy, the compound phases segregated along the interdendritic interfaces within the interiors of original grains provided the additional sites for continuous dynamic recrystallization via the particle stimulation nucleation mechanism. As a result, the as-cast alloy exhibited higher fractions of recrystallized grains and smaller grain sizes than the extruded alloy after compression. The stress exponent values of the as-cast alloy were smaller than those of the extruded alloy. In the processing maps, the domain associated with high power dissipation efficiencies (≥35%) occurred in a wider temperature range in the as-cast alloy compared to the extruded alloy. The segregated phases that remained undissolved in the as-cast alloy after compressive deformation could be effectively eliminated during the solid solution treatment (753 K for 2 h) for T6 aging applied after hot compression. The current results suggest the possibility and advantage of omitting the extrusion step when preparing 7xxx aluminum forging or extrusion feedstocks for hot working. The proposed method can be applied to other precipitation hardenable aluminum alloys.

Optimization of process parameters of Zy4/TRISO composite using processing maps and breakage rate

Zr-1 wt% Nb is extensively utilized as a structural material for fuel rod cladding in nuclear power plant reactors. The microstructural refinement of the cladding alloy in the hot manufacturing stage not only increase its mechanical properties but also influences the fuel rod's performance and integrity. In the present study, the hot compressive behavior and microstructural evolution with the aim to identify the recrystallization mechanism type in Zr-1 wt% Nb was investigated. Hence, the hot compression test was conducted at different temperature range of 600-900 ◦C and strain rates of 0.001-1 s-1. At the hot deformation temperature of 600 ◦C, the compressive stress was monotonically increasing with straining due to the occurrence of the work-hardening mechanisms in the deformation process. At the high deformation temperatures of 700 ◦C and above, the compressive strength initially increased until it reached the peak stress, after which it gradually decreased and settled into the steady state region. Investigating the hot deformed microstructures imply that significant grain refinement was obtained through the dynamic recrystallization occurrence. It was concluded that the continuous dynamic recrystallization and dynamic recovery were among the first softening mechanisms activated up to strains of 0.3 and then the discontinuous dynamic recrystallization completes the grain refinement in the microstructure.

The hot compression behavior and microstructure evolution of ingot metallurgy (I/M) and powder metallurgy (P/M) processed samples of the near-{gamma} Ti-aluminide alloy, Ti-48Al-2Nb-2Cr (at%), were determined. Three I/M conditions and two P/M conditions were examined in this study. Hot compression tests were performed in the temperature range 1,100--1,300 C at strain rates ranging from 1.67 {times} 10{sup {minus}1}/sec to 1.67 {times} 10{sup {minus}4}/sec. P/M materials consolidated by either hot isostatic pressing (HIP`ing) or extrusion exhibited the best hot workability in most cases. The P/M materials possessed finer, more homogeneous microstructures than the I/M materials. It was also noted that improved workability, and in some cases superplastic behavior, was observed in the materials with equiaxed microstructures without any lamellar constituents.

The hot compression behavior and microstructure evolution of ingot metallurgy (I/M) and powder metallurgy (P/M) processed samples of the near-γ Ti-Aluminide alloy, Ti-48A1-2Nb-2Cr (at%), were determined. Three I/M conditions and two P/M conditions were examined in this study. Hot compression tests were performed in the temperature range of 1100°-1300°C at strain rates ranging from 1.67x10^-1/sec to 1.67x10^-4/sec. P/M materials consolidated by either hot isostatic pressing (HIP'ing) or extrusion exhibited the best hot workability in most cases. The P/M materials possessed finer, more homogenous microstructures than the I/M materials. It was also noted that improved workability was observed in materials with equiaxed microstructures without any lamellar constituents.

Hot compression behavior and recrystallization mechanism of 1.5 wt% Ti3AlC2 ceramic-enhanced Mo alloys with two-dimensional layers