Mechanistic origin and prediction of enhanced ductility in magnesium alloys

被引：566
作者：
Wu, Zhaoxuan [1 ,2 ]
Ahmad, Rasool [1 ]
Yin, Binglun [1 ]
Sandloebes, Stefanie [3 ]
Curtin, W. A. [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Inst Mech Engn, CH-1015 Lausanne, Switzerland
[2] Inst High Performance Comp, 1 Fusionopolis Way,16-16 Connexis, Singapore 138632, Singapore
[3] RWTH Rheinisch Westfal TH Aachen Univ, Inst Met & Met Phys, Kopernikusstr 14, D-52074 Aachen, Germany
来源：
SCIENCE | 2018年 / 359卷 / 6374期
基金：
瑞士国家科学基金会;
关键词：
SOLID-SOLUTION ALLOYS; RARE EARTH ALLOYS; STRETCH FORMABILITY; MG-ZN; ROOM-TEMPERATURE; ZR ALLOYS; MN ALLOY; CE ALLOY; TEXTURE; CA;
D O I：
10.1126/science.aap8716
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Pure magnesium exhibits poor ductility owing to pyramidal < c + a > dislocation transformations to immobile structures, making this lowest-density structural metal unusable for many applications where it could enhance energy efficiency. We show why magnesium can be made ductile by specific dilute solute additions, which increase the < c + a > cross-slip and multiplication rates to levels much faster than the deleterious < c + a > transformation, enabling both favorable texture during processing and continued plastic straining during deformation. A quantitative theory establishes the conditions for ductility as a function of alloy composition in very good agreement with experiments on many existing magnesium alloys, and the solute-enhanced cross-slip mechanism is confirmed by transmission electron microscopy observations in magnesium-yttrium. The mechanistic theory can quickly screen for alloy compositions favoring conditions for high ductility and may help in the development of high-formability magnesium alloys.
引用
收藏
页码：447 / 451
页数：5
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