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采用气体保护法制备了含Ca的Mg-Zn-xCa(x=1,2,3)合金,研究了Ca对该类合金显微组织和力学性能的影响。结果表明,Ca能细化Mg-Zn-xCa合金铸态和时效态的组织,改善铸态组织形态。当Ca的加入量为1%时,未形成新相或沉淀物,而是溶入α-Mg初生相,提高其热稳定性;当Ca增加到2%和3%后,合金在基体α-Mg周围形成连续分布的Mg6Zn3Ca2和Mg2Ca第二相。经380℃×20 h固溶、180℃×96 h时效后,Mg-12Zn-xCa系合金的硬度先增加、后减少,在Ca为2%时达到最大值89.7 HB。
The Ca-containing Mg-Zn-xCa (x = 1, 2, 3) alloys were prepared by gas-barrier method. The effects of Ca on the microstructure and mechanical properties of these alloys were investigated. The results show that Ca can refine the as-cast and aged microstructures of Mg-Zn-xCa alloys and improve the as-cast microstructure. When the content of Ca is 1%, no new phase or precipitate is formed, but dissolve into the α-Mg primary phase to improve its thermal stability. When Ca is added to 2% and 3% A continuous distribution of Mg6Zn3Ca2 and Mg2Ca second phases forms around Mg. The hardness of Mg-12Zn-xCa alloy first increases and then decreases after 380 ℃ × 20 h solution aging and 180 ℃ × 96 h aging, reaching the maximum value of 89.7 HB when Ca is 2%.