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材料工程  2017, Vol. 45 Issue (6): 17-23    DOI: 10.11868/j.issn.1001-4381.2015.000920
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
半固态触变挤压对ZA27合金组织和力学性能的影响
刘占勇, 左孝青, 钟子龙, 李威威
昆明理工大学 材料科学与工程学院, 昆明 650093
Effect of Semi-solid Thixo-extrusion on Microstructures and Mechanical Properties of ZA27 Alloy
LIU Zhan-yong, ZUO Xiao-qing, ZHONG Zi-long, LI Wei-wei
College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
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摘要 通过与常规铸造方法的比较,研究半固态触变挤压对ZA27合金变质、热处理组织和力学性能的影响。结果表明:半固态挤压态合金的密度较铸态合金提高了3%,合金经Sc变质或者半固态挤压都获得了细小而均匀的近似球状组织,而Sc变质结合半固态挤压的球状组织具有最高的圆整度;经T6热处理的半固态挤压合金由细小的初生α相和共析(α+η)组织组成,说明半固态挤压可促进ε相溶解、减少三元共晶(β+η+ε)组织的含量。力学性能测试表明,ZA27合金经半固态挤压+Sc变质+T6热处理后其抗拉强度,伸长率和布氏硬度分别达到586.01MPa,17.57%及171HB。
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刘占勇
左孝青
钟子龙
李威威
关键词 ZA27合金Sc变质半固态触变挤压微观组织力学性能    
Abstract:Through comparative study with normal casting, the effects of semi-solid thixo-extrusion on microstructures and mechanical properties with modification treatment and heat treatment of ZA27 alloys were studied. The results show that the density of semi-solid thixo-extrusion ZA27 alloy increases by 3% compared to the one obtained by normal casting, fine spherical uniform microstructure is obtained by Sc modification treatment or semi-solid thixo-extrusion, and the best roundness of the globular grains is obtained by Sc modification combined with semi-solid thixo-extrusion. The microstructure of ZA27 alloy by semi-solid thixo-extrusion combined with T6 heat treatment is composed of small α primary phase and (α+η) eutectoid phase, which shows that semi-solid thixo-extrusion can promote the dissolution of ε phase and reduce (β+η+ε) ternary eutectic content. The mechanical properties test indicates that the tensile strength, elongation and Brinell hardness of the ZA27 alloy by semi-solid thixo-extrusion, and after Sc modification and T6 heat treatment, are up to 586.01MPa, 17.57% and 171HB respectively.
Key wordsZA27 alloy    Sc modification    semi-solid thixo-extrusion    microstructure    mechanical property
收稿日期: 2015-07-25      出版日期: 2017-06-20
中图分类号:  TG249.2  
通讯作者: 左孝青(1964-),男,教授,博导,主要从事多孔金属材料、有色金属及其复合材料方面研究,联系地址:云南省昆明市五华区学府路昆明理工大学材料科学与工程学院(650000),E-mail:zxqdzhhm@163.com     E-mail: zxqdzhhm@163.com
引用本文:   
刘占勇, 左孝青, 钟子龙, 李威威. 半固态触变挤压对ZA27合金组织和力学性能的影响[J]. 材料工程, 2017, 45(6): 17-23.
LIU Zhan-yong, ZUO Xiao-qing, ZHONG Zi-long, LI Wei-wei. Effect of Semi-solid Thixo-extrusion on Microstructures and Mechanical Properties of ZA27 Alloy. Journal of Materials Engineering, 2017, 45(6): 17-23.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000920      或      http://jme.biam.ac.cn/CN/Y2017/V45/I6/17
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