深冷处理对WTi10合金组织和性能的影响  

Effects of Cryogenic Treatment on Microstructure and Properties of W-10wt%Ti Alloy

作　　者：代卫丽[1] 梁淑华[1] 王玉佩[1] 

机构地区：[1]西安理工大学陕西省电工材料与熔渗技术重点实验室,陕西西安710048

出　　处：《稀有金属材料与工程》2015年第9期2290-2294,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51174161);陕西省科技统筹创新计划(2012KPCQ01-14);陕西省电工材料与熔渗技术重点科技创新团队(2012KCT-25)

摘　　要：对固相烧结的WTi10合金在–196℃下进行了深冷处理。对合金的显微硬度、XRD物相、SEM及TEM形貌等进行了分析和表征。结果表明:深冷处理后,合金的组成依然为富钨相和富钛相;随深冷时间的增加,钨钛合金组织中富钛相所占面积比例先增大后减小,24 h深冷处理后组织中富钛相的比例与未处理试样的差别不大;合金的晶粒尺寸也呈现先增大后减小的变化趋势,24 h后晶粒尺寸最大减小了24.6%;晶粒尺寸分布更加均匀。深冷处理能显著提高WTi10合金的显微硬度和致密度,深冷处理24 h后合金的显微硬度大约是深冷前的2.5倍;深冷24 h后合金的择优取向由(110)变为(110)和(200)。W-10wt%Ti alloys prepared by solid state sintering were treated at –196 °C. The properties and microstructures of W-10wt%Ti alloys were analyzed comparatively by microhardness measurement, X-ray diffraction, SEM and TEM. The results show that after cryogenic treatment, W-10wt%Ti alloys are still composed of W-rich and Ti-rich solid solution. The content of Ti-rich phase increases and then decreases with prolonging the cryogenic time, but there is no obvious change for the Ti-rich phase in the sample with 24 h cryogenic treatment compared with the untreated sample. The alloy grain size also increases and then decreases, and it is reduced by 24.6% after 24 h cryogenic treatment, reaching the minimum; meanwhile, the grain sizes are uniformly distributed. Cryogenic treatment can significantly improve the microhardness and relative density of WTi10 alloy, and the hardness after 24 h cryogenic treatment is about 2.5 times higher than that of originality; the preferred orientation of the alloy cryogenic treated for 24 h is changed from（110） to（110） and（200）.

关 键 词：WTi10合金 深冷处理 晶粒择优取向 显微硬度 致密度 

分 类 号：TG146.411[一般工业技术—材料科学与工程] TG156.91[金属学及工艺—金属材料]