含铈的Mg-Al-Zn系镁合金显微结构及组织性能研究

Study on Microstructure and Mechanical Properties of Mg Alloy with Ce

选择AZ31、AZ61和AZ91镁合金,通过加入不同含量的铈元素,系统研究了铈元素对镁-铝-锌系镁合金的热变形行为、相组成、微观组织结构和力学性能的影响。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。添加铈的8#合金有最高的强度,轧制态,其抗拉强度为350 MPa,屈服强度为274 MPa,伸长率为6.2%;退火后,抗拉强度、屈服强度和伸长率分别为306.1 MPa、201.4 MPa和18.7%。

The effects of Ce addition on hot deforming behavior,phase structure,microstructure and mechanical property of AZ31,AZ61 and AZ91 magnesium alloy were systematically studied.The experiment shows that Al4Ce phase forms after adding Ce element into the alloys,which can strengthen the alloys and improve the microstructure as-annealed after rolling but not for as-cast.The mechanical property test shows that the No.8 alloy with Ce content has the best mechanical properties,σb,σs,δ of the alloy as-rolled is 350 MPa,274 MPa and 6.2% respectively,and after annealing 306.1 MPa,201.4 MPa and 18.7% respectively.