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| 不同热处理工艺对Mg–Y–Zn–V合金组织力学性能的影响 |
| Effects of Different Heat Treatment Processes on the Microstructureand Mechanical Properties of Mg-Y-Zn-V Alloy |
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| DOI：10.3969/j.issn.1674-6457.2022.06.006 |
| 中文关键词: 长周期堆垛有序结构 镁合金 热处理 微观组织 力学性能 |
| 英文关键词: long period stacking ordered (LPSO) magnesium alloy heat treatment microstructure mechanical properties |
| 基金项目:山西省重大科技专项(20191102007);山西省高等学校大学生创新创业训练项目(2020086) |
| Author Name | Affiliation | | SHI Qun | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | HAN Fu-yin | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | ZHENG Can | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | ZHANG Chang-jiang | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | ZHANG Shu-zhi | College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| 中文摘要: |
| 目的 探索合适的热处理工艺，以调控合金的晶粒尺寸和LPSO相特征(形貌、类型、体积分数和分布)，从而优化其力学性能。方法 通过改变热处理时间及冷却方式得到一系列Mg–Y–Zn–V合金，利用X射线衍射、光学显微镜、扫描电镜和拉伸测试等手段分析热处理后合金的微观组织及力学性能。结果 在500 ℃、24 h固溶处理后，通过水冷得到的合金性能最佳，极限抗拉强度为190 MPa，屈服强度为129 MPa，伸长率为18.4%。随着热处理时间的延长，18R相逐渐固溶到基体中，而W相在发生球化后很难进一步固溶到基体，且在不同的冷却方式下LPSO相呈现块状、杆状和针状3种形态。结论 固溶处理后球化的W相和块状18R相可以提高合金性能，而层片状LPSO则会降低合金的力学性能。 |
| 英文摘要: |
| The paper aims to explore the appropriate heat treatment process and regulate the grain size of the alloy (morphology, type, volume fraction, and distribution) to optimize its mechanical properties. A series of Mg-Y-Zn-V alloys were obtained by changing the heat treatment time and cooling method. The microstructure and mechanical properties of the alloys after heat treatment were analyzed by X-ray diffraction, optical microscope, scanning electron microscope, and tensile testing. After solution treatment at 500 ℃ for 24 h, the alloy obtained by water cooling had the best performance, with ultimate tensile strength of 190 MPa, yield strength of 129 MPa, and elongation of 18.4%. With the extension of the heat treatment time, 18R phase gradually dissolved into the matrix, while the W phase was difficult to further dissolve into the matrix after spheroidization. And under different cooling methods, the LPSO phase presented three forms:block, rod and lamellar. After solution treatment, the spheroidized W phase and block 18R can improve the properties of the alloy, while the lamellar LPSO will reduce the mechanical properties of the alloy. |
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