复合添加Yb,Zr,Ti对超高强Al-Zn-Mg-Cu合金组织和力学性能的影响

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摘要采用铸锭冶金法制备分别复合添加Yb-Zr,Zr-Ti,Yb-Ti和Yb-Zr-Ti的4种Al-Zn-Mg-Cu合金,通过金相显微镜、扫描电镜和透射电镜观察,结合硬度和强度测试,对比研究这4种合金的热挤压态与固溶-时效态组织和力学性能。结果表明：复合添加Yb-Ti的Al-Zn-Mg-Cu合金,在热挤阶段即形成明显的亚晶界。经固溶处理后,复合添加Yb-Ti和Zr-Ti的合金发生明显的再结晶,而复合添加Yb-Zr和Yb-Zr-Ti的合金由于析出大量尺寸为10~20 nm、共格的Al₃(Zr,Yb)弥散相,抑制再结晶效果明显。复合添加Yb-Ti的Al-Zn-Mg-Cu合金中析出了微米级Al₈Cu₄Yb和Al₂₀Ti₂Yb相,诱发基体再结晶。完全未再结晶的Al-Zn-Mg-Cu-Yb-Zr合金具有最高的力学性能和断裂韧性,抗拉强度、屈服强度、伸长率和断裂韧性分别为721.9 MPa,711.5 MPa,9.7 %和29.3 MPa·m^1/2,呈现完全的韧窝型断裂特征,完全再结晶的Al-Zn-Mg-Cu-Yb-Ti合金力学性能最低,断裂方式为完全的沿晶断裂。

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	方华婵
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关键词 ： Al-Zn-Mg-Cu合金, 微量元素, 微观组织, 再结晶, 力学性能

Abstract：Four kinds of Al-Zn-Mg-Cu alloys adding Yb, Zr, Ti were prepared by cast metallurgy. Effects of Yb-Zr, Zr-Ti, Yb-Ti, Yb-Zr-Ti additions on the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy were compared by optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), hardness and tensile test. The results show that, the Al-Zn-Mg-Cu alloy with Yb-Ti additions forms obvious subgrain boundaries during hot extrusion. After solution treatment, the alloys with Yb-Ti and Zr-Ti additions have obvious recrystallization. The alloys with Yb-Zr and Yb-Zr-Ti have obvious effect of restraining recrystallization due to the precipitation of a large number of coherent Al₃(Zr,Yb) dispersed phases with size of 10-20 nm. Micron-sized Al₈Cu₄Yb and Al₂₀Ti₂Yb phases are precipitated in Al-Zn-Mg-Cu alloy with Yb-Ti addition, which induce the matrix recrystallization. Al-Zn-Mg-Cu-Yb-Zr alloy without recrystallization has the highest mechanical properties and fracture toughness, the ultimate strength, yield strength, elongation and fracture toughness are 721.9 MPa, 711.5 MPa, 9.7 %, 29.3 MPa·m^1/2, respectively, and exhibits complete dimple fracture characteristics. The mechanical properties of Al-Zn-Mg-Cu-Yb-Ti alloy with complete recrystallization are the lowest, and the fracture mode is complete intergranular fracture.

Key words： Al-Zn-Mg-Cu alloys trace element microstructure recrystallization mechanical property

收稿日期: 2018-11-13 出版日期: 2019-07-12

ZTFLH:

TG142.6

基金资助:国家自然科学青年基金资助项目(51501228); 湖南省自然科学基金资助项目(2015JJ3167); 中南大学研究生科研创新项目(2018zzts419)

作者简介: 方华婵,副教授,博士。电话：0731-88830614;E-mail: fanghc@csu.edu.cn

引用本文:

方华婵, 朱佳敏, 陈卓, 刘滩. 复合添加Yb,Zr,Ti对超高强Al-Zn-Mg-Cu合金组织和力学性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(2): 176-187.
FANG Huachan, ZHU Jiamin, CHEN Zhuo, LIU Tan. Effect of Yb, Zr, Ti additions on the microstructure and mechanical properties of super-high strength Al-Zn-Mg-Cu alloys. Materials Science and Engineering of Powder Metallurgy, 2019, 24(2): 176-187.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I2/176

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