超高强导电Cu-Ni-Si-Al合金的TTP曲线  

TTP diagrams of Cu-6.0Ni-1.0Si-0.5Al-0.15Mg-0.1Cr alloy with super high strength and good conductivity

作　　者：王晶[1] 李周[1,2] 李思[1] 邢岩[1] 申镭诺[1] 雷前[3] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程湖南省重点实验室,长沙410083 [3]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2016年第7期1466-1472,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51271203);中南大学创新驱动计划资助项目~~

摘　　要：设计并制备一种超高强导电Cu-6.0Ni-1.0Si-0.5Al-0.15Mg-0.1Cr（质量分数,%）合金。通过测量合金的硬度,分析经固溶处理并分别经600~850℃等温处理后再在450℃时效处理1 h的合金力学性能的变化规律,建立合金的时间-温度-性能（TTP）曲线。通过透射电镜观察,研究合金在等温处理过程中的第二相的析出规律。结果表明：合金的鼻尖温度约为725℃,淬火敏感区域为675~775℃。合金在淬火敏感区进行等温处理时,晶内析出的δ-Ni_2Si和Ni_3Al迅速形核和长大;延长等温时间,析出相粗化,合金的硬度随之降低。合金在鼻尖温度附近表现出高的淬火敏感性。A novel Cu-6.0Ni-1.0Si-0.5Al-0.15Mg-0.1Cr（mass fraction, %） alloy was designed and prepared. The changes of mechanical properties of the alloy under different isothermal conditions（600-850 ℃） after solution treated with 980 ℃ were studied, and on the basis of micro-hardness measurement, time-temperature-property（TTP） curves of the alloy were established. The transformation behavior during isothermal heat treatment was studied by transmission electron microscopy. The results show that the nose-temperatures of the curve is about 725 ℃, and quenching sensitivity region ranges from 675 ℃ to 775 ℃. As the alloy is isothermally treated in the quenching sensitivity region, the nucleation rate and growth rate of δ-Ni_2Si and Ni_3Al particles are high. With the isothermal holding time, the precipitated phases are coarsened rapidly, and the micro-hardness decreases. The alloy shows high quench sensitivity as it is treated around the nose-temperature.

关 键 词：CuNiSiAl合金 等温处理 淬火敏感性 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]