摘要
采用氢化钛粉代替钛粉,与镁粉混合高能球磨,研究球磨工艺参数对粉末性能的影响。采用机械合金化法这种非平衡态的粉末冶金方法,通过高能球磨粉末,提高Mg在Ti中的固溶度。利用激光粒度仪、X线衍射仪、扫描电镜等测试分析仪器表征粉末的性能。研究发现,随球磨时间延长,混合粉末的粒径逐渐变小,确定16 h为最佳球磨时间。Mg的衍射峰随球磨时间增加而逐渐减弱,球磨8 h后基本消失,表明球磨过程可促使Ti和Mg原子的合金化。选取4%(质量分数)的硬脂酸作为过程控制剂,能有助于减小颗粒尺寸且能有效防止粉末冷焊,粉末的收得率提高至73.3%。
The effects of processing parameters on ball-milling magnesium powder and titanium hydride powder instead of titanium powder were investigated. High solid solubility of magnesium in titanium can be obtained by mechanical alloying, which is in a metastable state. The properties of powders were characterized by laser particle analyzer, X-ray diffractometer, and scanning electron microscope. The results show that the particle size of powder mixture decreases with the increase of milling time, and that 16 h is the best milling time. The phenomenon that XRD peaks of Mg decrease and then disappear after milling for 8 h. It shows that ball-milling process can promote the alloying of Ti and Mg. The yield rate of powders can be improved substantially to 73.3% by taking 4wt% stearic acid as processing control agent.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2016年第4期626-631,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51301205)
教育部高等学校博士学科点专项科研基金(20130162120001)
深圳市科技计划(CXY201107010187A)
关键词
钛镁合金
球磨
过程控制剂
氢化钛
镁粉
Ti-Mg alloy
ball-milling
process control agent
TiH2
Mg powder
