摘要
以Al-5Ti-B和Al-10RE为变质剂对汽车用Al-Si合金进行了复合变质处理,研究了Al-10RE含量和热处理对Al-Si合金组织与力学性能的影响。结果表明:Al-10RE含量为0.6%时,Al-Si合金中的针状共晶硅转变为短棒状、α-Al枝晶得到了较好细化;AlSi合金的硬度、抗拉强度和断后伸长率随着Al-10RE含量的增加呈现先增加后降低的趋势,在Al-10RE含量为0.6%时取得最大值;T6热处理使合金中共晶硅的形态从杆状转变为类球形,复合变质处理的Al-Si合金在T6热处理工艺下可以获得更加细小、均匀的共晶硅相;T6热处理后,未变质处理和复合变质处理的Al-Si合金的抗拉强度都较铸态合金有所提高,而断后伸长率略有降低。
Effect of AI-10RE content and heat treatment on microstructure and mechanical properties of AI-Si alloy were studied by using A1- 10RE and A1-STi-B as the modifier. The results show that, when the AI-10RE content is 0.6%, the acicular eutectic Si phase in A1-Si alloy is transformed to short rod, and ct-A1 dendrite is well refined. The hardness, tensile strength and elongation of A1-Si alloy increase at first and then decrease with the increasing of AI-10RE content, the maximum values are obtained at AI-10RE content of 0.6%. The eutectic silicon in the A1-Si alloy change from rod into spherical after T6 heat treatment, the composite modified of A1-Si alloy in the T6 heat treatment process can obtain a more fine and uniform eutectic silicon phase; after T6 heat treatment, the tensile strength without modification and with composite modified A1-Si alloy are all higher than that of as-cast alloy, while elongation decrease slightly.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第6期138-142,共5页
Heat Treatment of Metals
关键词
复合变质
T6热处理
AL-SI合金
组织
力学性能
composite modification
T6 heat treatment
A1-Si alloy
microstructure
mechanical properties
