Precipitation behaviors of 14H LPSO lamellae in Mg96Gd3Zn0.5Ni0.5 alloys during severe plastic deformation

被引：29
作者：
Liu, Wei [1 ,2 ]
Zhang, Jinshan [1 ,2 ]
Xu, Chunxiang [1 ,2 ]
Zong, Ximei [1 ,2 ]
Zhu, Wei [1 ,2 ]
Ma, Qiangqiang [1 ,2 ]
机构：
[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Shanxi, Peoples R China
[2] Shanxi Key Lab Adv Magnesium Based Mat, Taiyuan 030024, Shanxi, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE | 2017年 / 52卷 / 22期
基金：
中国国家自然科学基金;
关键词：
DYNAMIC RECRYSTALLIZATION BEHAVIOR; STACKING ORDERED STRUCTURE; Y-ZN ALLOYS; MECHANICAL-PROPERTIES; ZR ALLOY; AS-CAST; MICROSTRUCTURE EVOLUTION; GRAIN-REFINEMENT; 773; K; MG;
D O I：
10.1007/s10853-017-1431-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A high-performance extruded Mg96Gd3Zn0.5Ni0.5 alloy containing 14H LPSO phases and two different dynamic recrystallization (DRX) grains was successfully fabricated, which exhibited superior ultimate tensile strength (400 MPa) and outstanding elongation (20%). Meanwhile, the results show that the substitution of 0.5 at.% Zn with Ni element can refine the grain size of as-cast Mg96Gd3Zn1 alloy significantly. While limited 14H LPSO lamellae are formed near the block 14H LPSO phases due to Ni addition during solution treatment, copious 14H LPSO lamellae induced by external force are precipitated in alpha-Mg matrix after subsequent hot extrusion in the Mg96Gd3Zn0.5Ni0.5 alloy. Furthermore, two different DRX phenomena are successively stimulated with increasing deformation strain. Discontinuous DRX emerges first at the interface of block 14H LPSO phases, and then continuous DRX occurs in the kink bands of 14H LPSO lamellae. The precipitation behaviors of 14H LPSO lamellae and two types of DRX grains contribute to the excellent mechanical properties.
引用
收藏
页码：13271 / 13283
页数：13
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