摘要
对汽车发动机缸体用Al-Si-Fe合金进行了半固态触变挤压成形和T1、T6热处理,研究了不同制备工艺下Al-Si-Fe合金的显微组织、物相组成、力学性能和耐磨性能。结果表明,经过半固态挤压触变成形可以破碎合金中的初生硅和α-Al基体,晶粒组织得到细化;经过触变成形得到的Al-Si-Fe合金的强度和塑性都较铸态合金有明显提高,且经过T6热处理后的强度有所增加,而塑性略有降低;铸态、T1、T6和触变成形态Al-Si-Fe合金的耐磨性能要明显高于A390合金;铸态Al-Si-Fe合金的磨损机制为粘着磨损和磨粒磨损,而触变成形态和T6热处理态Al-Si-Fe合金的磨损机制主要为磨粒磨损。
The Al-Si-Fe alloy used for automobile engine cylinder block was prepared by semi solid thixo extrusion forming and T1,T6 heat treatment,the microstructure,phase composition,mechanical properties and wear resistance of Al-Si-Fe alloy prepared by different process were investigated.The results show that the semi-solid thixo extrusion forming can break the alloy primary silicon and α-Al matrix,the grains are refined.The strength and plasticity of Ai-Si-Fe alloy after thixo forming is obviously improved,and after T6 heat treatment,the strength increases although plastic is slightly lower.The wear resistance of as-cast,T1,T6 state and thixo formed Al-Si-Fe alloy is significantly higher than that of A390 alloy.The wear mechanism of as-cast Al-Si-Fe alloy is adhesive wear and abrasive wear,while the wear mechanism of thixo forming and T6 heat treatment state Al-Si-Fe alloy is mainly abrasive wear.
出处
《铸造技术》
CAS
北大核心
2016年第10期2136-2138,2148,共4页
Foundry Technology
基金
国家自然科学基金重点资助项目(51335009)
