时效处理对Cu-Ni-Si合金电阻及组织的影响  

Effect of Aging Treatment on Resistance and Microstructures of Cu-Ni-Si Alloy

作　　者：谢辉[1] 吕品正[2,3] 张蓉 贾磊[2] 吕振林[2] 陶世平[1] 吴伟刚[1] 

机构地区：[1]西安航空学院机械学院,陕西西安710077 [2]西安理工大学材料科学与工程学院,陕西西安710048 [3]西安热工研究院有限公司,陕西西安710032 [4]中国西电西安西电变压器有限责任公司,陕西西安710077

出　　处：《铸造技术》2014年第12期2838-2840,2853,共4页Foundry Technology

基　　金：国家自然科学基金(U1034002);陕西省自然科学基础研究计划项目-青年人才项目(2013JQ6006);陕西省教育厅专项科研计划项目(2013JK0899);陕西省工业攻关计划项目(2013K09-13)

摘　　要：采用带有同步水淬功能的原位电阻测量装置结合OM、XRD及TEM分析等方法,研究了等温时效处理对Cu-Ni-Si合金电阻及组织的影响。结果表明,Cu-Ni-Si合金时效阶段电阻随时间变化趋势表现为先下降后趋于稳定。随着时效温度的升高,合金电阻在时效初期急剧下降,这是由于时效时沉淀相在过饱和固溶体中析出所致。时效阶段Cu-Ni-Si合金中沉淀析出相为δ-Ni2Si,初始形态为点状,随着时效时间的延长,沉淀析出相长大,形态逐渐变为针状。The effects of isothermal aging treatment on the electric resistance and the microstructure of Cu-Ni-Si alloy was investigated using the in-situ resistance measurement device equipped with rapid water-quenching, and the microstructures and the phase composition of Cu-Ni-Si alloys were analyzed using optical microscope （OM）, X-ray diffractometer （XRD） and transmission electron microscopy （TEM）. The results show that, at the initial aging treatment stage, the electric resistance of Cu-Ni-Si alloy firstly declines and then stabilizes at a certain value, which are due to the precipitation of super-saturated Ni and Si atoms from copper solid solutions. The precipitation could be confirmed as δ-Ni2Si phase with globular morphology. By increasing the aging treatment times, the δ-Ni2Si precipitates coarsen with the change of morphology from globular to acicular.

关 键 词：等温时效 CU-NI-SI合金 电阻原位测量 析出相 

分 类 号：TG156.92[金属学及工艺—热处理] TG146.11[金属学及工艺—金属学]