Abstract
The effect of B addition on the microstructure and mechanical properties of AM50 was investigated, and the mechanism of grain refinement was clarified. Optical microscopy, X-ray diffraction, scanning electron microscopy, and electron probe microanalysis were used to characterize the microstructure evolution. The grain size of as-cast AM50 decreased from 550 μm to 100 μm with the B content increasing from 0 to 0.15 wt.%. AlB2 particles in the Al-3B master alloy transformed to Mg-B, and acted as the grain refiner. The addition of B to as cast AM50 alloy results in improved mechanical properties of AM50 + xB alloys. For instance, the YTS (yield tensile strength), UTS (ultimate tensile strength), and elongation of as cast AM50 + 0.15 wt.% B alloy was 94 MPa, 215 MPa, and 12.3%.
Highlights
Mg alloys are widely used to make components in numerous industries, such as aerospace, automobile, and 3C (Computer, Communication, Consumer electronics), due to their low density, high specific strength and stiffness, good damping characteristics, electromagnetic shielding capacity, adequate formability, and good cast ability [1,2,3]
The present study indicated that the grain refining particle was rich in Mg instead of Al
The influence of B addition on the microstructure and mechanical properties of as-cast AM50 alloy was revealed in the present work
Summary
Mg alloys are widely used to make components in numerous industries, such as aerospace, automobile, and 3C (Computer, Communication, Consumer electronics), due to their low density, high specific strength and stiffness, good damping characteristics, electromagnetic shielding capacity, adequate formability, and good cast ability [1,2,3]. Zr cannot be used for refining Al-containing Mg alloy [9], because Zr reacts with Al to form Al3 Zr. An effective grain refiner of Al containing Mg alloys is needed. Suresh et al [15] reported that a B containing master alloy such as Al-4B could refine the grains of the as cast AZ91 alloy. They found that increasing the B content from 0 to 0.04 wt.% refined the grain size from 100 μm to 30 μm; and increased the yield tensile strength, ultimate tensile strength, and the elongation from 95 MPa to 113 MPa, 118 MPa to 229 MPa, 3.3% to 4.9%, respectively. This work studied the effects of B on the grain refinement of the Mg alloy AM50, and clarified the mechanism of grain refinement
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
