以ZK61合金粉末为原料,通过放电等离子烧结的方法制备了ZK61生物镁合金块体,研究了不同烧结温度对合金块体微观组织和力学性能的影响.结果表明:制备出的ZK61合金块体内部结构致密,组织分布均匀,晶粒细小,块体致密度随烧结温度逐渐提高,在520℃时达到99.24％;随着烧结温度的升高,粉末颗粒间原子扩散作用增强,ZK61合金块体的力学性能也逐渐提高,在烧结温度为520℃时综合性能最好,其中显微硬度由370℃时的69.2 HV增加到79.3 HV,抗压强度和抗弯强度也获得最大值,分别为304 MPa和94.7 MPa,压缩率逐渐变大,韧性提高.
Using ZK61 alloy powder as raw material,ZK61 bio-magnesium alloy was prepared by spark plasma sintering,and the effect of different sintering temperatures on microstructure and mechanical properties of the alloy was studied.The results show that the internal structure of the ZK61 alloy is compact,and the microstructure is uniform and the grain size is small.The relative density of the alloy increases with the increasing of sintering temperature,and reaches the maximum value of 99.24％ at 520 ℃.The atomic diffusion effect between powder particles is strengthened with the sintering temperature increasing,it results in the improvement of the mechanical properties of the ZK61 alloy.When sintering temperature is 520 ℃,the microhardness of the alloy increases to 79.3 HV from 69.2 HV at 370 ℃,the compressive strength and flexural strength of the ZK61 alloy are 304 MPa and 94.7 MPa,respectively,and the compression ratio is gradually increasing,and the toughness is improved.
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