机械合金化对W-Ti合金组织与性能的影响-中国有色金属学报.PDF

第 19 卷第 3 期 中国有色金属学报 2009 年 3 月 Vol.19 No.3 The Chinese Journal of Nonferrous Metals Mar. 2009 文章编号：1004-0609(2009)03-0529-09 机械合金化对W-Ti 合金组织与性能的影响 王庆相，范志康，杨 怡 (西安理工大学 材料科学与工程学院，西安 710048) 摘 要：以乙醇为过程控制剂，采用机械球磨方法制备W-10%Ti(质量分数) 、W-10%TiH2 纳米晶 W-Ti 粉末，晶 粒粒径为 30~80 nm，粉体经压制后在 1 823 K 保温烧结 80 min 得到 W-Ti 合金。利用 X 射线衍射、透射电镜和扫 描电镜等手段，研究球磨时间对两种粉末及其烧结试样的相组成和微观组织的影响；测量烧结试样的密度和显微 硬度。结果表明：机械合金化能够降低烧结温度，提高烧结体的密度，组织均匀且晶粒细小；利用 W-TiH2 球磨 粉制备的 W-Ti 合金与 W-Ti 粉相比密度较高且晶粒细小。 关键词：W-Ti 合金；机械合金化；密度；显微硬度 中图分类号：TG 146.4 文献标识码：A Influence of mechanical alloying on structure and properties of W-Ti alloy WANG Qing-xiang, FAN Zhi-kang, YANG Yi (School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China) Abstract: W-Ti nanocrystalline alloying powders of 30−80 nm with composition of W-10%Ti (mass fraction) and W-30% TiH2 were prepared by mechanical milling in alcohol media. The W-Ti alloy was prepared by pressing and sintered at 1 823 K for 80 min using W-Ti powders. The phase constituent and microstructure of the powders and alloy billets were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The density and micro-hardness of the alloy billets were also measured. The results show that mechanical alloying is helpful to decrease the sintering temperature and increase the density. The microstructure of the alloys is well-proportioned and the size of crystal is small