论文部分内容阅读
以铸态Mg-7Al-1Si合金为基体,单独添加变质剂Gd及复合添加变质剂Gd与Ca,对比研究不同变质剂对铸态Mg-7Al-1Si合金组织及性能的影响。结果表明,单一添加变质剂Gd及复合添加变质剂Gd与Ca均能明显细化Mg-7Al-1Si合金的晶粒尺寸,β-Mg_(17)Al_(12)相细小弥散且含量降低。单一添加Gd及复合添加Gd与Ca后,蠕变应变量分别降低了69.3%、80.7%。复合添加Gd与Ca后,合金的抗高温蠕变性能比单独加入稀土元素Gd时更好。变质剂Gd与Ca有效改善了Mg-7Al-1Si合金的摩擦磨损性能。
The effects of different modifiers on the microstructure and properties of as-cast Mg-7Al-1Si alloy were studied by using as-cast Mg-7Al-1Si alloy as matrix, adding modifier Gd and compounding modifier Gd and Ca separately. The results show that the grain size of Mg-7Al-1Si alloy can be remarkably thinned and the content of β-Mg_ (17) Al_ (12) phase finely dispersed and decreased with the addition of single modifier Gd and composite modifier Gd and Ca. After a single addition of Gd and a combination of Gd and Ca, the amount of creep strain decreased by 69.3% and 80.7%, respectively. After the addition of Gd and Ca, the high temperature creep property of the alloy is better than the addition of rare earth element Gd alone. Modification agent Gd and Ca effectively improve the friction and wear properties of Mg-7Al-1Si alloy.