时效时间对Fe-Cu二元合金力学性能的影响(英文)  

Effect of Aging Time on the Mechanical Properties of Fe-Cu Binary Alloys

作　　者：黄志涛[1] 冷文秀[2] 田文怀[1] 

机构地区：[1]北京科技大学,北京100083 [2]中国石油大学(北京),北京102249

出　　处：《稀有金属材料与工程》2013年第S2期565-569,共5页Rare Metal Materials and Engineering

基　　金：National Nature Science Foundation of China(50671012)

摘　　要：研究了Fe-Cu合金时效过程中力学性能的变化规律。分别用透射电镜和扫描电镜观察了析出相和拉伸断口的形貌。结果表明,析出相尺寸随时效时间的延长而增加;在时效2.1×103 s之前,合金的强度显著增强,延伸率和断面收缩率减小;在时效1.08×105 s之内,合金的强度均高于固溶处理,且强度与硬度保持线性关系;在时效2.1×103 s后,延伸率和断面收缩率略有增加,但是强度下降;在时效峰处和过时效阶段,析出相均为软质相。The changes in mechanical properties during tensile experiment of Fe-Cu alloys for different aging time were investigated.The microstructures of precipitates and fracture morphologies were observed by transmission electron microscopy(TEM) and scanning electron microscopy(SEM),respectively.The size of Cu rich precipitations increases with the prolonged aging time.Before aging at 773 K for 2.1×103 s,a substantial increase in strength has been obtained,accompanied with a drop in percentage elongation and area reduction.Besides,the strength of Fe-Cu alloys with aging for 2.1×103～1.08×105 s is higher than that with solid solution treatment.A linear relationship between strength and hardness exists in Fe-2.0Cu alloy during aging process.After aging at 773 K for 2.1×103 s,the elongation and area reduction of Fe-2.0Cu alloy increase a little with decreasing in strength.The precipitations are soft phases in both aging hardening process and over-aging stage.

关 键 词：力学性能 析出相 延伸率 时效过程 

分 类 号：TG156.92[金属学及工艺—热处理]