Author:
Kumar Mariyappan Arul,Wroński Marcin,Beyerlein Irene J.
Abstract
Hexagonal close-packed (HCP) magnesium alloys are widely used in automotive and aerospace industries due to their low density and high specific-strength. Their applicability is mainly restricted due to poor formability and pronounced plastic anisotropy. The formability is usually improved by altering the chemistry (adding rare-earth elements like Y) or modulating the microstructure (e.g., grain refinement). However, grain refinement alone cannot yield the desired ductility, and the scarcity of rare-earth elements also limits the extent to which the alloying strategy can be used. To overcome these issues, in this work, it is proposed that the formability of Mg alloys can be improved by combining the grain refinement and alloying approaches. To quantitively explore this possibility, a crystal-plasticity-based constitutive model, which is sensitive to both alloying concentration and grain sizes, is developed. To demonstrate, the model is applied to study the combined effect of Y content and grain size on the mechanical responses of Mg alloy. The calculations are used to build maps of plastic anisotropy measures, such as tension–compression asymmetry ratio and Lankford coefficients, for a wide range of Y content and grain sizes. From these maps, the grain size that would yield the desired performance of Mg alloy for a fixed Y content can be identified. This work provides an accelerated pathway to optimize both the microstructure and chemistry simultaneously to achieve formability and to reduce the dependence on alloying.
Funder
Office of Basic Energy Sciences
AGH University of Science and Technology
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference109 articles.
1. Critical Assessment 6: Magnesium sheet alloys: Viable alternatives to steels?;Kim;Mater. Sci. Technol.,2014
2. Magnesium and its alloys applications in automotive industry;Kulekci;Int. J. Adv. Manuf. Technol.,2008
3. Magnesium and aluminum alloys in automotive industry;Musfirah;J. Appl. Sci. Res.,2012
4. Weight Loss with Magnesium Alloys;Pollock;Science,2010
5. Magnesium alloys: An alternative for aluminium in structural applications;Shu;Adv. Mater. Res. Trans Tech. Publ.,2011
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献