The role of dislocations in strain hardening of an extension twinning predominant deformation
作者： Liangchen Lv , Yunchang Xin , Huihui Yu , Rui Hong , Qing Liu
DOI: 10.1016/J.MSEA.2015.04.007
关键词: Dislocation 、 Precipitation hardening 、 Materials science 、 Crystal twinning 、 Metallurgy 、 Crystallite 、 Work hardening 、 Hardening (metallurgy) 、 Strain hardening exponent 、 Composite material 、 Deformation (engineering)
摘要: Abstract A { 10 1 ¯ 2 } twinning predominant deformation of polycrystalline Mg alloys is often characterized by a low yield stress and high degree strain hardening. In this study, an interrupted compression-unloading-annealing-recompression experiment pure extruded rod was used to study the role dislocations in hardening compression along extrusion direction. quantified contribution analyzed. Our results show that associated mechanisms play important Below 2.7%, dislocation are main mechanism, generating about 8–10 MPa. Other mechanisms, e.g. grain refinement texture twinning, not at stage. Upon further strain, both work hardenings from other rise. At 7.2%, reaches 22 MPa, accounting for 45% total It also found twin boundaries mechanism The condition volume fraction. With fraction below 20%, hardly induces obvious
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