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以通信材料Mg-Zn-Al-Ca合金为研究对象,对不同Al元素的铸态Mg-4Zn-x Al-0.2Ca合金微观组织及力学性能进行试验。结果表明:Mg-4Zn-0.2Ca合金由白色初生-Mg+Mg Zn2共晶组织组成,随Al元素含量不断增加,初生相逐渐变得细小且均匀,合金维氏硬度、弹性模量、和抗拉强度都不断增加,极限抗拉强度呈现先增加后减小的趋势,而断裂伸长率不断减小;当Al元素含量为3%时,该合金极限抗拉强度达到最大值201.8 MPa;当Al元素含量为1%时,合金的断裂伸长率最大值为12.5%。
The microstructure and mechanical properties of as-cast Mg-4Zn-xAl-0.2Ca alloys with different Al contents were tested by using the communication material Mg-Zn-Al-Ca alloy as the research object. The results show that the Mg-4Zn-0.2Ca alloy is composed of white primary-Mg + Mg Zn2 eutectic. With the increasing of Al content, the primary phase gradually becomes fine and uniform. The Vickers hardness, elastic modulus, The ultimate tensile strength increases first and then decreases, while the elongation at break decreases. When the Al content is 3%, the ultimate tensile strength of the alloy reaches the maximum of 201.8 MPa. When the Al content is 1%, the maximum elongation at break of the alloy is 12.5%.