12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Cast Alloys I
Program Organizers: Alan Luo, Ohio State University; Mihriban Pekguleryuz, McGill University; Sean Agnew, University of Virginia; John Allison, University of Michigan; Karl Kainer; Eric Nyberg, Kaiser Aluminum Trentwood; Warren Poole, University of British Columbia; Kumar Sadayappan, CanmetMATERIALS; Bruce Williams, Canmetmaterials Natural Resources Canada; Stephen Yue, Mcgill University
Thursday 9:50 AM
June 17, 2021
Room: Invited I
Location: Virtual
Session Chair: Eric Nyberg, Kaiser Aluminum Trentwood
9:50 AM Invited
An Analysis of the Tensile Deformation Behavior of Commercial Die-cast Magnesium-aluminum-based Alloys: Mark Easton1; Hua Qian Ang1; Suming Zhu1; Trevor Abbott2; 1RMIT University; 2Magontec Ltd
Magnesium and its alloys have a complex progression of deformation mechanisms due to the hexagonal closed-packed crystal structure. Magnesium undergoes a series of different deformation modes as stress increases. The deformation behavior is marked by the commencement of elastic (Stage I), followed by basal slip and twinning (Stage II), prismatic slip (Stage III) and finally pyramidal slip (Stage IV). In this study, the deformation behavior of a range of commercial die-cast magnesium-aluminum-based alloys are analyzed. Four distinct stages of strain hardening can be seen in the tensile stress–strain curve and these are modeled according to the assumption that they correspond to the four deformation mechanisms. It is shown that both Stages I and III can be described by a linear equation while Stages II and IV follow a power-law relationship and fitted with Hollomon’s equation. A semi-empirical equation is proposed to model the entire stress–strain curve.
10:20 AM Invited
Development of a Mg–RE Based Die-cast Magnesium Alloy for Elevated Applications: Xixi Dong1; Lingyun Feng1; Eric Nyberg2; Shouxun Ji1; 1Brunel University London; 2Tungsten Parts Wyoming
Magnesium (Mg) alloys capable of operating at working temperatures above 200 °C and having the ability to be produced using high pressure die casting for high-volume manufacturing are developed. Such cost-effective methods are required for manufacturing critical parts for internal combustion (IC) engines such as those used in power tools. Here we introduce the variables in Mg–RE based alloys and the die-casting process. The new Mg–RE die-cast alloy shows excellent ambient and high temperature tensile strength and creep resistance. In addition, the new Mg–RE alloy also shows good stiffness and thermal conductivity, which are key advantages for alloys used at elevated temperatures.