首页|采用挤压剪切工艺制备细晶高强韧镁合金

采用挤压剪切工艺制备细晶高强韧镁合金

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设计一种新型挤压剪切(ES)复合工艺以制备细晶高强韧镁合金.利用有限元软件Deform-3D,通过正交模拟实验对ES模具的结构参数进行优化,并采用ES模具对Mg−3Zn−0.6Ca−0.6Zr(ZXK310)合金进行成形.结果表明,优化的ES模具结构参数为挤压角ɑ=90°、挤压段高度h=15 mm以及内圆角半径r=10 mm.在挤压温度和模具温度为350℃进行挤压剪切时,ZXK310合金表现出良好的ES成形性,且成形区发生明显的动态再结晶,晶粒尺寸从挤压区的1.42μm降低到成形区的0.85μm.由于第二相钉扎及超细晶的形成,合金的抗拉强度、屈服强度和伸长率分别达到362 MPa、289 MPa和21.7％.
Fabrication of fine-grained, high strength and toughness Mg alloy by extrusion−shearing process
A novel extrusion−shearing (ES) composite process was designed to fabricate fine-grained, high strength and tough magnesium alloy. The structural parameters of an ES die were optimized by conducting an orthogonal simulation experiment using finite element software Deform-3D, and Mg−3Zn−0.6Ca−0.6Zr (ZXK310) alloy was processed using the ES die. The results show that the optimized structural parameters of ES die are extrusion angle (α) of 90°, extrusion section height (h) of 15 mm and inner fillet radius (r) of 10 mm. After ES at an extrusion temperature and a die temperature of 350℃, ZXK310 alloy exhibited good ES forming ability, and obvious dynamic recrystallization occurred in the forming area. The grain size decreased from 1.42 μm of extrusion area to 0.85 μm of the forming area. Owing to the pinning of second phase and formation of ultrafine grains, the tensile strength, yield strength and elongation of alloy reached 362 MPa, 289 MPa and 21.7％, respectively.

Mg−Zn−Ca−Zr alloyextrusion−shearing processdie designdynamic recrystallizationmechanical properties

王柏宁、王峰、王志、刘正、毛萍莉

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沈阳工业大学材料科学与工程学院,沈阳 110870

辽宁省镁合金及成形技术重点实验室,沈阳 110870

Mg−Zn−Ca−Zr合金 挤压剪切工艺 模具设计 动态再结晶 力学性能

This work is supported by Liaoning RevitalizationJoint Research Fund of Liaoning—Shenyang National Laboratory for Materials Science,ChinaInnovation Talent Program in Sciences and Technologies for Young and Middle-aged Scientists of Shenyang,ChinaScientific Research Fund of Liaoning Provincial Department of Education,China

XLYC18070212019JH3/30100014RC200414LJGD2020008

2021

10.1016/S1003-6326(21)65528-0

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(3)
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