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钙对Mg-4Zn合金组织,织构及力学性能的影响
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重庆大学材料科学与工程学院

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中国科学院重点资助项目,国家自然科学基金项目(面上项目,重点项目,重大项目)


The effect of calcium on microstructure, texture and mechanical properties of Mg-4Zn alloys
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College of Materials Science and Engineering, Chongqing University

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The Key Program of the Chinese Academy of Sciences,The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    本文研究了钙对Mg-4Zn合金组织,织构及力学性能的影响。铸态Mg-4Zn合金包含α-Mg相和MgZn相,Ca的加入还生成了Ca2Mg6Zn3三元相。结果表明,Ca显著细化挤压板材的晶粒尺寸,弱化板材织构。沿着板材横向,Mg-4Zn-0.3Ca合金的屈服强度为163MPa,最终抗拉强度达到260MPa。并且,加钙后的合金延伸率从Mg-4Zn合金的19%提高到24%。本文分析了合金的再结晶机制,织构演变机理和强韧化机制,另外,合金力学性能与各向异性也得到了分析。

    Abstract:

    In this paper, the effect of calcium (Ca) additions on microstructure, texture and mechanical properties of Mg-4Zn alloy has been investigated. The as-cast alloys consisted of α-Mg dendrites and MgZn phase, and Ca addition also caused the formation of ternary Ca2Mg6Zn3phase. Results showed that Ca elements significantly refined the grain size of extruded sheet and weakened the strong basal textures. Along the transverse direction (TD) of sheet, Mg-4Zn-0.3Ca alloy exhibited an ultimate tensile strength (UTS) of 260 MPa, tensile yield strength (TYS) of 163 MPa. Moreover, the elongation to failure of Ca containing alloy increased up to 24% compared to that of 19% for Mg-4Zn alloy. The recrystallization mechanism and texture evolution of the alloy have been analyzed. What"s more, the strengthening and toughening mechanism, includes the anisotropy of mechanical characteristics, both have been studied.

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刘春全,陈先华.钙对Mg-4Zn合金组织,织构及力学性能的影响[J].稀有金属材料与工程,2019,48(11):3506~3513.[liu chunquan, chen xianhua. The effect of calcium on microstructure, texture and mechanical properties of Mg-4Zn alloys[J]. Rare Metal Materials and Engineering,2019,48(11):3506~3513.]
DOI:10.12442/j. issn.1002-185X.20180551

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  • 收稿日期:2018-05-28
  • 最后修改日期:2018-05-31
  • 录用日期:2018-06-15
  • 在线发布日期: 2019-12-10
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