Al-Mg-Si-Mn合金时效性能及析出行为研究  

Study on Aging Performance and Precipitation Behavior of Al-Mg-Si-Mn Alloy

作　　者：李慎兰[1] 邱晓慧[1] 刘传生[1] Li Shenlan;Qiu Xiaohui;Liu Chuansheng(Aircraft Maintenance Engineering College, Guangzhou Civil Aviation College, Guangzhou 510470, China)

机构地区：[1]广州民航职业技术学院飞机维修工程学院,广东广州510470

出　　处：《有色金属加工》2022年第3期13-15,48,共4页Nonferrous Metals Processing

基　　金：广东省普通高校特色创新项目(2017GKTSCX001);广州民航职业技术学院校级项目(2018X0136)。

摘　　要：采用透射电镜、差示扫描量热分析和硬度测试等方法,研究了Al-Mg-Si-Mn合金的时效性能及析出行为。结果表明,实验合金在170℃时效8h达到硬度峰值,并在一段时间内能保持较高硬度,57h后硬度开始迅速下降;主要强化相β″可长时间从基体中析出,当合金中大量析出β′相和B′相时,硬度明显降低。实验合金的析出相析出顺序为,过饱和固溶体→团簇→GP区→β″相→β′相+B′相→β相。In this paper,the aging properties and precipitation behavior of an Al-Mg-Si-Mn alloy are studied by means of transmission electron microscopy(TEM),differential scanning calorimetry(DSC)analysis and hardness measurement.It is shown that the investigated alloy reaches its peak hardness after aging at 170℃for 8h.The alloy can maintain a high hardness in a period of time.The hardness began to decrease quickly after aging for 57h.Theβ″phase with the greatest strengthening effect continues being precipitated from the matrix for a long time.Whenβ′and B′phases precipitated from the alloy,the hardness decreases obviously.The precipitation sequence of investigated alloy can be described as:supersaturated solid solution→clusters→GP zone→β″→β′+B′→β.

关 键 词：Al-Mg-Si-Mn合金 性能 时效性能 析出行为 

分 类 号：TG166.3[金属学及工艺—热处理]