锰对铸造Zn-38Al-2.2Cu合金组织和热疲劳性能的影响  

Effect of Manganese on Microstructures and Thermal Fatigue Properties of Zn-38Al-2.2Cu Casting Alloy

作　　者：许亮[1] 司乃潮[1] 刘光磊[1] 许超[1] 尹拂晓[1] 万浩[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《有色金属（冶炼部分）》2013年第11期55-60,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：江苏省自然科学基金资助项目(BK2011524)

摘　　要：在Zn-38Al-2.2Cu合金中加入不同量的锰后,研究锰对合金力学性能和显微组织的影响。结果表明,合金中添加0.6%的锰后,部分锰元素溶入基体α′相,使α′相产生固溶强化,导致合金的耐热性及热疲劳性能提高。剩余的锰在基体上析出弥散度和热稳定性都很高的富锰相,提高了合金的热强性,弥补了高温环境下合金晶界薄弱的缺点。富锰相大小适中、分布均匀,对裂纹的传播和扩展有抑制作用,而当富锰相粗大、呈连续状分布时,有利于裂纹的扩展。The effect of adding manganese element in Zn-38A1-2.2Cu alloy on its mechanical properties and microstructures was investigated. The results show that with 0. 6% addition of manganese element in Zn- 38A1-2.2Cu alloy solution, part of manganese dissolves into matrix to enhance matrix, resulting in an ob- vious improvement of microstructures, thermal stability and thermal fatigue properties obviously. Heat re- sistance of the alloy is improved by high dispersity and thermal stability Mn-rich phases which is precipita- ted in matrix, and, the weak link of alloy grain boundary is avoided. Crack propagation and extension can be restrained by uniformly distributed Mn-rich phase with moderate size. On the contrary, bulky Mn-rich phase in continuous distribution facilitates propagation of crack.

关 键 词：Zn-38Al-2 2Cu合金 热疲劳 微观组织 固溶强化 

分 类 号：TG146.1[一般工业技术—材料科学与工程]