Grain Refinement Mechanism of Cast Mg-6Zn-xZr Alloy

Wu Zhilin; Zhang Shichang; Liu Sheng; Xiong Jiulang

doi:10.15980/j.tzzz.2018.01.024

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Grain Refinement Mechanism of Cast Mg-6Zn-xZr Alloy
Vol. 38, Issue 1, Pages: 89-92(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.01.024

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[1]吴志林,张诗昌,刘升,熊九郎.铸态Mg-6Zn-xZr合金晶粒细化的机制[J].特种铸造及有色合金,2018,38(01):89-92.

Wu Zhilin, Zhang Shichang, Liu Sheng, et al. Grain Refinement Mechanism of Cast Mg-6Zn-xZr Alloy. [J]. Special Casting & Nonferrous Alloys 38(1):89-92(2018)
[1]吴志林,张诗昌,刘升,熊九郎.铸态Mg-6Zn-xZr合金晶粒细化的机制[J].特种铸造及有色合金,2018,38(01):89-92. DOI： 10.15980/j.tzzz.2018.01.024.

Wu Zhilin, Zhang Shichang, Liu Sheng, et al. Grain Refinement Mechanism of Cast Mg-6Zn-xZr Alloy. [J]. Special Casting & Nonferrous Alloys 38(1):89-92(2018) DOI： 10.15980/j.tzzz.2018.01.024.

摘要

研究了Zr含量对Mg-6Zn-xZr合金组织细化及力学性能的影响。结果表明

随Zr含量的增加

晶粒尺寸及二次枝晶间距明显减小

硬度和强度升高。采用边-边匹配模型分析了Zr及ZnZr与α-Mg之间的匹配晶面与晶向

并计算了错配度。结果表明

Zr与α-Mg存在5组晶面与晶向匹配对

ZnZr与α-Mg也存在[11 2-0]

/[100]

ZnZr

‖（0002）

/（001）

ZnZr

匹配对

因此Zr与

ZnZr

均可作为非自发形核基底促进合金的形核并导致晶粒细化。

Abstract

The effects of Zr contents on microstructure refinement and mechanical properties of as-cast Mg-6 Zn-xZr alloy were investigated.The results reveal that with the increase of Zr content

grain size and the secondary dendrite spacing are decreased significantly

so the hardness and strength of the alloy are improved.The matching plane and direction between Zr and ZnZr withα-Mg system were analyzed by edge-to-edge matching model

and degree of the mismatch was calculated.The results reveal that the Zr andα-Mg have five groups of plane and direction matching pairs

and ZnZr andα-Mg also exist[11 2-0]

/[100]

ZnZr

‖（0002）

/（001）

ZnZr

matching pairs

thus Zr and ZnZr can be used as a heterogeneous nucleation substrate to promote nucleation and lead to grain refinement.

关键词

镁锌合金锆晶粒细化机制边-边匹配模型

Keywords

Mg-Zn AlloyZrGrain Refinement MechanismEdge-to-Edge Matching Model

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Effects of Sc and Zr on Microstructure and Properties of As-cast and Heat-treated State 7055 Aluminum Alloy