耦合修正分析Al−Fe−Ni合金蠕变机理  

Coupling analysis on controlling mechanisms for creep of Al−Fe−Ni alloy

作　　者：卞泽宇 朱爱林 肖亚开 李宇罡 马乃恒[1,4] 卞汉兵 汪明亮 陈哲[2] 王浩伟 Ze-yu BIAN;Ai-lin ZHU;Ya-kai XIAO;Yu-gang LI;Nai-heng MA;Han-bing BIAN;Ming-liang WANG;Zhe CHEN;Hao-wei WANG(State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Laboratoire de Génie Civil et Géo-Environnement,Universitéde Lille,F-59000 Lille,France;Anhui Aluminium Matrix Composites Engineering Research Centre,Huaibei 235000,China)

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240 [2]上海交通大学材料科学与工程学院,上海200240 [3]Laboratoire de Génie Civil et Géo-Environnement,Universitéde Lille,F-59000 Lille,France [4]安徽省铝基复合材料工程研究中心,淮北235000

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第5期1331-1344,共14页中国有色金属学报（英文版）

基　　金：the scholarship support from the Chinese Scholarship Council;the financial supports from the National Natural Science Foundation of China (No. 52071207);the China Postdoctoral Science Foundation (Nos. 2019TQ0193, 2019M661497);the National Key Research and Development Program of China (No. 2018YFB1106302);Anhui Provincial Engineering Research Center of Aluminum Matrix Composites, China (No. 2017WAMC002)

摘　　要：在引入阈值应力和载荷传递系数后,对Al−Fe−Ni合金的蠕变本构方程进行耦合修正,描述该合金在300和400℃下的位错蠕变。量化结果分析及显微组织表征表明,蠕变过程中位错与共晶相间复杂交互作用是阈值应力的起源。同时,共晶相与基体之间模量的差异引起共晶相分担应力作用。此外,温度对基体及共晶相模量产生的影响差异导致高温时合金阈值应力降低,而应力转移系数增大。这些现象通过有限元模型分析得到进一步的论证。总体而言,共晶合金位错蠕变的控制机理得到了更深层次的量化认识。The dislocation creep of Al−Fe−Ni alloy at both 300 and 400℃was described by a coupling modification on analyzing the creep constitutive equation after introducing both threshold stress and load transfer coefficient.The quantitative results and microstructure characterizations showed that the complex interaction between dislocation and eutectic phase was the origin of threshold stress,and the modulus difference between matrix and eutectic phase induced the load transfer effect.Furthermore,the temperature effects on the modulus of matrix and eutectic phase were different,leading to the decline of threshold stress and increase of load transfer coefficient at higher temperatures.This was further evidenced by the finite element modelling analysis.Finally,the controlling mechanisms during dislocation creep of eutectic alloys were discussed in an increasingly quantitative manner.

关 键 词：位错蠕变 铝合金 共晶相 应力转移效果 阈值应力 

分 类 号：TG146.21[一般工业技术—材料科学与工程]