Development of high-strength, low-cost wrought Mg-2.0 mass% Zn alloy with high Mn content

被引:36
作者
Pan, Fusheng [1 ,2 ,3 ]
Mao, Jianjun [1 ,2 ]
Zhang, Gen [1 ,2 ]
Tang, Aitao [1 ,2 ]
She, Jia [1 ,4 ]
机构
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China
[3] Chongqing Acad Sci & Technol, Chongqing Res Ctr Adv Mat, Chongqing 401123, Peoples R China
[4] Nucl Power Inst China, Sci & Technol Reactor Syst Design Technol Lab, Chengdu 610213, Peoples R China
基金
中国国家自然科学基金;
关键词
Magnesium alloy; Mg-Zn alloy; Microstructure; Ultra-fine grains; Second phase; Mechanical properties; MECHANICAL-PROPERTIES; MICROSTRUCTURE; MAGNESIUM; BEHAVIOR;
D O I
10.1016/j.pnsc.2016.11.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Mg-Zn-Mn-based alloys have received considerable attention because of their high creep resistance, strength, and good corrosion resistance. The alloying element Mn in Mg-Zn-based alloys is commonly less than 1 wt%. In the present study, the effect of high Mn content (1 wt% and 2 wt%) on the microstructures and mechanical properties of Mg-2Zn-0.3Sr extruded alloy was investigated. The results revealed that the high Mn content significantly increased the ultimate tensile strength, tensile yield strength, compress yield strength, and yield asymmetry of the alloy without affecting its ductility. The dynamically recrystallized (DRXed) grains of Mg2-Zn-0.3Sr were remarkably refined because of the large amount of fine Mn precipitates in the homogenized alloy. The improved strengths were mainly attributed to the fine DRXed grains according to the Hall-Petch effect and to the large amount of spherical and < 0001 > Mn precipitates through the precipitation and dispersion strengthening. The fine DRXed grains and numerous Mn precipitates effectively suppressed the extension twining, substantially enhanced the compress yield strength, and resulted in improved anisotropy.
引用
收藏
页码:630 / 635
页数:6
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