新型Al-Mn合金均匀化处理过程中组织和性能演变  

Evolution of microstructure and properties of new Al-Mn alloy during homogenization treatment

作　　者：李雪峰[1] 张辉[1,2] 蒋福林[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]湖南大学湖南省喷射沉积技术及应用重点实验室,长沙410082

出　　处：《中国有色金属学报》2014年第2期380-386,共7页The Chinese Journal of Nonferrous Metals

基　　金：国际科技合作计划项目(010S2010GR0739)

摘　　要：通过差热分析、金相显微镜、扫描电子显微镜、能谱分析、硬度和电导率测试等方法,对一种新型Al-Mn合金铸锭均匀化过程中的组织演变和性能变化规律进行研究。结果表明：在加热温度为560-620℃、保温时间为12-72 h的均匀化处理过程中,合金铸锭的电导率随温度的升高或保温时间的延长逐渐降低,但硬度先持续降低后在高于600℃均匀化时反而升高;合金铸锭由枝晶和晶间非平衡相组成,随均匀化温度的升高和保温时间的延长,晶间析出相逐渐溶解、球化,晶内细小弥散相大量析出;合金较优的热处理制度为600℃、24 h。The evolution of microstructure and properties of a new Al-Mn alloy ingot during homogenization treatment was researched by differential scanning calorimetry （DSC）, optical microscopy （OM）, scanning electron microscopy （SEM）, energy dispersive X-ray analysis （EDAX）, as well as measurement of hardness and conductivity test, respectively. The results show that both the conductivity and the hardness of Al-Mn alloy ingot decrease with the increase of temperature in the range of 560-620℃or the extension of holding time in the range of 12-72 h, but hardness at 620℃is higher than that at 600 ℃. The cast alloy is composed of dendrite segregation and non-equilibrium phase. The precipitated phases gradually dissolve and become spherical, and the dispersity of precipitates within the grains increases with increasing homogenization temperature and holding time. The reasonable homogenization condition for the studied alloy is 600℃and 24 h.

关 键 词：AL-MN合金 均匀化 性能 显微组织 析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]