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Al-TCB晶种合金对ZL302铝合金微观组织及力学性能的影响
Influence of Al-TCB Seed Alloy on the Microstructure and Mechanical Properties of ZL302 Alloy
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- DOI:
- 作者:
- 李春晓1高通1吴桐思柳1栗梦玉1刘桂亮2刘相法1
LI Chunxiao 1 , GAO Tong 1 , WU Tongsiliu 1 , LI Mengyu 1 , LIU Guiliang 2 , LIU Xiangfa
- 作者单位:
- 1. 山东大学材料液固结构演变与加工教育部重点实验室2. 山东迈奥晶新材料有限公司
1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China; 2. Shandong Mai Ao Jing Advanced Materials Co., Ltd., Linyi 276000, China
- 关键词:
- Al-TCB晶种合金;ZL302;晶粒细化;力学性能
Al-TCB seed alloy; ZL302; grain refinement; mechanical properties
- 摘要:
- 铝镁合金具有较高的比强度、良好的耐蚀性和焊接性,是未来空天、高速列车、海洋等领域极具竞争力的材料,对该合金强塑性能的设计是行业关注的焦点之一。本文采用Al-TCB晶种合金对ZL302铝合金进行了微观组织与力学性能调控,利用光学显微镜、场发射扫描电镜、万能试验机等对ZL302合金的晶粒形貌与尺寸及拉伸性能进行了测试与分析。实验结果表明,相比于Al-5Ti-1B中间合金,Al-TCB晶种合金对ZL302合金的晶粒细化效果更显著,可由毫米级细化至67.5μm,组织中的树枝晶转变为等轴晶形态;对合金进行拉伸性能测试,添加1%(质量分数)的Al-TCB晶种合金后,ZL302合金的抗拉强度和延伸率由208.0 MPa和5.8%提升至218.8 MPa和9.7%。因此,Al-TCB晶种合金能够减小ZL302的晶粒尺寸,从而提升其力学性能。
Al-Mg alloys have high specific strength, good corrosion resistance and weldability and are very competitive materials in theaerospace, high-speed train, marine and other fields in the future.The design of the strength and plasticity of the alloy is one of the focuses in the industry. In this paper, the microstructure and mechanical properties of ZL302 aluminum alloy were regulated by adding Al-TCB seed alloy. The grain morphology, grain size, microstructure and mechanical properties of ZL302 were analysed by OM, TEM and universal testing machine. The results show that the Al-TCB seed alloy exhibits a better grain refinement effect on the ZL302 alloy compared with the Al-5Ti-1B master alloy. The average grain size of ZL302 can be refined from millimeters to 67.5 μm by adding Al-TCB seed alloy, and dendrites transform into equiaxed grains in the microstructure. After the addition of 1%(mass fraction) Al-TCB seed alloy, the tensile strength and elongation of the ZL302 alloy increase from 208.0 MPa and 5.8% to 218.8 MPa and 9.7%, respectively. Therefore, Al-TCB seed alloys can improve mechanical properties by reducing the grain size of ZL302.