温度对Co-8.8Al-9.8W-1.5Ta合金γ′相形貌和结构的影响  

Effect of Temperature on theγ′Phase Morphology and Structure of Co-8.8Al-9.8W-1.5Ta Alloy

作　　者：徐仰涛[1,2] 常鑫 XU Yangtao;CHANG Xin(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《有色金属工程》2021年第1期7-16,共10页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51561019);甘肃省自然科学基金资助项目(1308RJYA022)。

摘　　要：为了研究温度对Co-8.8Al-9.8W-1.5Ta合金中强化相γ′相形貌结构的影响,利用SEM、XRD、TEM等表征手段,对不同固溶温度下制备的合金Co-8.8Al-9.8W-1.5Ta中强化相γ′-Co3(Al,W)相的形貌以及结构进行研究。结果表明:不同温度下制备的合金析出物相相同,主要包括γ-Co、γ′-Co3(Al,W)、Co3Ta和CoCx相;合金的制备温度不影响其物相组成,但对合金强化相的形貌有很大的影响。制备温度为1300℃时,合金中γ′相的组织形貌保持高度立方状,温度过高或过低时都使γ′相形貌偏向于圆形;固溶温度会影响合金中晶体取向和Ta元素的分布。固溶温度为1300℃时,γ′-Co3(Al,W)相中Al和W的原子比趋向于1,而温度过高或过低时,都会加大W在γ′-Co3(Al,W)相中的原子占比,并且Ta元素主要分布在强化相γ′上。In order to study the effect of temperature on the structure of the strengthenedγ′phase morphology in Co-8.8Al-9.8W-1.5Ta alloy,the phase morphology and structure of the strengthened phaseγ′-Co3(Al,W)in the alloy Co-8.8Al-9.8W-1.5Ta prepared at different solution temperatures were investigated using SEM,XRD,TEM and other characterization methods.The results showed that the precipitated phases of the alloy prepared at different temperatures were the same,mainly includingγ-Co,γ′-Co3(Al,W),Co3Ta and CoCx phases.The preparation temperature does not affect the phase composition of the alloy,but it has a great influence on the morphology of the strengthened phase.When the preparation temperature was 1300℃,the microstructure morphology of theγ′phase in the alloy remained high cubic shape.When the temperature was too high or too low,the morphology of theγ′phase tended to be round.The solution temperature will affect the crystal orientation and Ta element distribution in the alloy.Solid solution temperature is 1300℃,γ′-Co3(Al,W)phase of Al and W atomic ratio tends to 1,and the temperature too high or too low,will promote the W inγ′-Co3(Al,W)of atoms in the proportion,and Ta elements are mainly distributed on the strengtheningγ′phase.

关 键 词：Co-8.8Al-9.8W-1.5Ta合金 γ′-Co3(Al W)相 晶体取向 微观组织 

分 类 号：TG146.1+6[金属学及工艺—金属材料]