Study on the effect of solution treatment on hot deformation behavior and workability of Mg-7Gd-5Y-0.6Zn-0.8Zr magnesium alloy

被引：41
作者：
Xu, Wenchen [1 ]
Jin, Xueze [1 ]
Shan, Debin [1 ]
Chai, Baixin [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 720卷
基金：
中国国家自然科学基金;
关键词：
Solution treatment; Deformation behavior; Activation energy; Processing map; Flow instability; DYNAMIC RECRYSTALLIZATION BEHAVIOR; Y-ZR ALLOY; PROCESSING MAP; CONSTITUTIVE ANALYSIS; ELEVATED-TEMPERATURE; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; MG-9.5ZN-2.0Y ALLOY; SHEAR DEFORMATION; CREEP-BEHAVIOR;
D O I：
10.1016/j.jallcom.2017.05.277
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of solution treatment on hot deformation behavior and workability of Mg-7Gd-5Y-0.6Zn-0.8Zr alloy has been studied by isothermal compression test in the temperature range from 350 degrees C to 500 degrees C and the strain rate range from 0.001s(-1) to 1s(-1). The precipitation of LPSO phases inside the deformation grains of solution treated alloy increased when the strain rate reduced (<= 0.01s(-1) in particular), and decreased when the deformation temperature rose beyond 475 degrees C. The precipitation of LPSO phases and existence of stacking faults hindered the growth of dynamically recrystallized grains and caused insufficient DRX. After solution treatment, the deformation activation energy increased by 34.65KJ/mol compared to the as-cast alloy due to increased solute amount of REs in the Mg matrix. Besides, solution treatment narrowed the flow instability region of Mg-7Gd-5Y-0.6Zn-0.8Zr alloy at low temperature and high strain rate due to more homogenous deformation, but weakened the hot working ability at high temperature due to higher sensitivity of deformation microstructure to temperature. The processing maps of as-cast and solution treated alloy exhibited two similar dynamic recrystallization (DRX) regions, i.e. Region I (390-440 degrees C, 0.001-0.01s(-1)) and Region II (440-465 degrees C, 0.01-0.1s(-1)). Besides, the as-cast alloy possessed a wider workability region (Region III: 465-500 degrees C and 0.03-1s(-1)) than the solution treated alloy (Region III: 465-490 degrees C and 0.3-1s(-1)) at high temperature. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：309 / 323
页数：15
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