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利用SEM、X射线衍射、拉伸性能测试、显微硬度测试等手段研究了合金元素Ca及时效处理对ZA102镁合金铸态组织和力学性能的影响。结果表明1%的Ca对合金铸态组织的改善效果最为明显,τ相(Mg32(Al,Zn)49)由断续网状变为细小的块状且分布弥散,ε相(MgZn)变得更加细小,同时形成了分布弥散的Al2Ca强化相,此时合金的抗拉强度和拉伸性能达到最大值,抗拉强度达到174 MPa、伸长率达到6%、硬度达到86 HV。如果Ca的含量超过1%合金的晶粒开始变大并且合金元素有偏聚的趋势,并导致其力学性能降低。对铸态试验合金在360℃×10 h+180℃(T6)下进行时效处理,结果表明经过T6处理后能进一步改善合金的组织和力学性能。
The effects of alloying elements Ca and aging treatment on the as-cast microstructure and mechanical properties of ZA102 magnesium alloy were studied by SEM, X-ray diffraction, tensile test and microhardness test. The results show that the effect of 1% Ca on the as-cast microstructure of the alloy is most obvious. The phase (Mg32 (Al, Zn) 49) changes from a discontinuous reticular to a fine lump and disperses. The ε phase More fine and formed dispersed Al2Ca phase. At this time, the tensile strength and tensile property of the alloy reached the maximum, the tensile strength reached 174 MPa, the elongation reached 6% and the hardness reached 86 HV. If the content of Ca exceeds 1%, the grain size of the alloy starts to increase and the alloying elements tend to segregate, resulting in a decrease in the mechanical properties. The as-cast test alloy was aged at 360 ℃ × 10 h + 180 ℃ (T6). The results show that the microstructure and mechanical properties of the alloy can be further improved by T6 treatment.