稀土铈对AZ61镁合金显微组织和力学性能的影响
Effect of Ce Element on Microstructure and Mechanical Properties of AZ61 Alloy
唐良宝, 陶利民
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作者单位：(桂林电子科技大学 机电工程学院, 广西 桂林 541004)
中文关键字：AZ61镁合金； 铈； 轧制； 微观组织； 力学性能
英文关键字：AZ61 alloy; cerium; microstructure; mechanical properties
中文摘要：在AZ61合金中添加0%、0.5%、1%和1.5%(质量分数)的铈(Ce)制备了4种合金，研究了Ce含量和合金变形状态对其力学性能和显微组织的影响。实验表明，添加Ce元素后，形成的Al4Ce对合金有强化作用，但其铸态组织仍然粗大，需要经过轧制及退火，合金组织才能得到改善。力学性能测试结果表明，随Ce含量的增加，轧制态合金强度上升，伸长率有所提高。300 ℃退火l h后，强度比轧制态有所降低，但伸长率提高较大。含1.0%Ce的3#合金具有最好的综合力学性能，挤压 + 轧制加工态其抗拉强度、屈服强度和伸率长分别为350 MPa、274 MPa和6.2%；300 ℃ × 1 h退火后，分别为306 MPa、201 MPa和18.7%。
英文摘要：Four kinds of alloys were prepared with Ce content of 0%, 0.5%, 1% and 1.5%, and the effects of Ce content and deformation state on microstructure and mechanical properties were investigated. The results show that the Al4Ce phase is formed after adding Ce element to AZ61 alloy, which can strengthen the alloys and improve the microstructure as-annealed after roiling but not for as-cast. The mechanical property test shows that the strength and elongation of the alloys are improved by adding Ce in rolled and annealed states. The 3# alloy with 1%Ce has superior mechanical properties at 300 ℃ × 1 h annealing, i.e. σs , σb , and δ is 201 MPa, 306 MPa and 18.7%, respectively.