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| Mg-Gd-Y-Zr 活塞微观组织及力学性能研究 |
| Microstructure and Mechanical Property of Mg-Gd-Y-Zr Magnesium Alloy Piston |
| Received:July 01, 2016 Revised:July 10, 2016 |
| DOI：10.3969/j.issn.1674-6457.2016.04.014 |
| 中文关键词: 镁合金 活塞 金属重力铸造 组织 力学性能 |
| 英文关键词: magnesium alloy piston metal gravity casting microstructure mechanical properties |
| 基金项目:黑龙江省自然科学基金（E201442） |
| Author Name | Affiliation | | HU Mao-liang | School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China | | JI Ze-sheng | School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China | | WANG Qu-dong | National Engineering Research Center for Light Alloy Net Forming, Shanghai Jiaotong University, Shanghai 200240, China | | ZHU Yao | School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China | | XU Hong-yu | School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China |
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| 中文摘要: |
| 目的 研究 Mg-Gd-Y-Zr 镁合金活塞本体的微观组织和力学性能。 方法 采用金属型重力铸造工艺制备镁合金活塞，利用光学显微镜和扫描电镜分析了铸态、固溶态（T4）和固溶时效态（T6）活塞本体的显微组织，利用岛津材料试验机和硬度计测试活塞本体的力学性能。 结果 铸态 Mg-Gd-Y-Zr镁合金活塞本体组织中大量的第二相分布于晶界处， T4 处理后大部分固溶到基体中， T6 处理后晶粒内部出现麻点状和细条状的析出相。活塞裙部和顶部经 T6 处理后的抗拉强度随着拉伸温度的升高而逐渐降低，在 300 ℃拉伸时活塞裙部抗拉强度达到 226.38 MPa；活塞裙部和顶部的伸长率随着拉伸温度的升高而增加，在 350 ℃拉伸时活塞裙部伸长率达到 23.65%。 结论 镁合金活塞裙部的室温和高温抗拉强度好于活塞顶部，裙部尺寸较均匀。 |
| 英文摘要: |
| In order to study microstructure and mechanical property of Mg-Gd-Y-Zr magnesium alloy piston body, this paper analyzed the microstructures of piston body that was produced by metal gravity casting under as-cast, solution treatment (T4) and aging treatment (T6) conditions by optical microscope and scanning electron microscope. It measured the mechanical properties by Shimadzu tensile testing machine and hardness tester. As a result, the secondary phases were distributed along grain boundary in the as-cast Mg-Gd-Y-Zr microstructure of the piston and mostly dissolved into α-Mg matrix after T4 treatment. Amounts of the pitting-shaped and strip-shaped precipitation phases appeared in the grains after T6 treatment. The ultimate tensile strengths of piston skirt and piston top after T6 treatment decreased with increasing temperature. The ultimate tensile strength of piston skirt could reach 226.38 MPa at the tensile temperature of 300 ℃. The elongation of piston skirt and piston top increased with increasing temperature. At the tensile temperature of 350 ℃, the elongation of piston skirt could reach 23.65%. In conclusion, the ultimate tensile strength of magnesium alloy piston skirt at room temperature and high temperature is higher than that of piston top, and the grain size of piston skirt is relatively uniform. |
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