采用机械合金化制备Mg(76-x)Ti(12+x)Ni9Cr3(x=4,8,12,16)合金,通过X射线衍射(XRD)、热分析(DSC)、扫描电子显微镜(SEM)和压强-成分-温度(PCT)分析等方法对合金进行分析和表征.结果表明:Mg(76-x)Ti(12+x)Ni9Cr3(x=4,8,12,16)合金相主要由Mg2Ni相和Ti2Ni相组成,随着球磨时间的增加,合金得到明显的细化且非晶化程度提高.Mg(76-x)Ti(12+x)Ni9Cr3(x=4,8,12,16)合金经过20～80 h球磨后,其贮氢量分别从3.93%,3.82%,3.64%和2.81%下降到2.36%,2.16%,1.81%和2.0%;合金经过活化后,在80 s内吸氢趋于饱和,显示合金良好的吸氢速率.随着Ti/Cr比例的增大以及球磨时间的增加,合金的吸氢速率下降,经过40 h球磨后Mg(76-x)Ti(12+x)Ni9Cr3(x=4,8,12,16)合金氢化物的释氢温度分别为277,255,245和233℃,释氢温度随着Ti含量的增加而降低.
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