Strength Improvement in ZK60 Magnesium Alloy Induced by Pre-deformation and Heat Treatment

被引：13
作者：
Chen Xianhua [1 ,2 ]
Liu Lizi [1 ]
Pan Fusheng [1 ,2 ,3 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China
[2] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400045, Peoples R China
[3] Chongqing Acad Sci & Technol, Chongqing 401123, Peoples R China
来源：
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2016年 / 31卷 / 02期
基金：
中国国家自然科学基金; 对外科技合作项目（国际科技项目）;
关键词：
ZK60; alloy; strength; solid solution; pre-cold rolling; aging; Y-ZR ALLOYS; MECHANICAL-PROPERTIES; AGING TREATMENT; MICROSTRUCTURE; CU; CONDUCTIVITY; EXTRUSION; BEHAVIOR;
D O I：
10.1007/s11595-016-1381-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of pre-deformation and heat treatment on mechanical properties of as-extruded ZK60 alloy was investigated. The experimental results indicated that the solid solution, pre-cold rolling and artificial aging treatments remarkably improved the mechanical strength of alloys compared with the as-extruded condition. Especially, pre-cold rolling in 5% reduction combined with artificial aging at 150 degrees C for 20 h was determined as the optimum heat treatment condition, which resulted in a yield strength of 333 MPa with an increment of 87 MPa and ultimate tensile strength of 373 MPa. High density of nanoscale precipitates in alpha-Mg matrix observed in this sample was beneficial to enhancing the strength. The as-extruded sample showed a typical brittle fracture while the solution treated sample exhibited ductile-fragile failure characterized by cleavage fractures, river patterns, and tear ridges. And the sample after pre-cold rolling combined with aging presented more equiaxial dimples with a great amount of cracked particles in them. The above-mentioned observations were analyzed in terms of microstructure and possible strengthening mechanism in the extruded ZK60 alloy.
引用
收藏
页码：393 / 398
页数：6
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