摘要
熔炼制得不同Mg含量的汽车发动机缸体材料Al-Si-Cu合金,以实验制得的合金为研究对象,研究了Mg元素含量对其微观组织、力学性能的影响。结果表明:汽车发动机缸体材料Al-Si-Cu合金中加入一定量的Mg能显著提高铸态及T6态合金的抗拉强度、硬度;随着Mg含量的增加,合金中开始产生Mg_2Si相,Mg_2Si相强化了合金的抗拉强度与屈服强度;但过多Mg元素将不能全部溶入基体,产生较粗大的Mg_2Si脆性相,降低合金抗拉强度及硬度,试验合金中加入0.4%Mg的合金力学性能最佳;随着冷却速率的增加,合金抗拉强度、屈服强度和硬度均增加。
Al-Si-Cu alloys with different Mg contents for automobile engine cylinder were obtained by melting,the effect of Mg content on the microstructure and mechanical properties of the alloy was studied.The results show that adding a certain amount of Mg in the alloys can significantly improve the tensile strength,hardness of as-cast and T6-state alloys,improve the mechanical properties of the alloy.With the increase of Mg content,Mg_2Si phase appear in the alloys,which reinforces the tensile strength and yield strength of the alloy.However,excessive Mg element will not be all dissolved,resulting in coarser Mg_2Si brittle phase,it can reduce the tensile strength and hardness.The optimum mechanical property of test alloy can be obtained when adding 0.4% Mg.With the increase of cooling rate,the tensile strength,yield strength and hardness of the alloy increase.
出处
《铸造技术》
CAS
北大核心
2016年第7期1329-1332,共4页
Foundry Technology
基金
北华航天工业学院青年基金资助项目(KY-2014-14)
廊坊市科技计划资助项目(2015011023)
