双步球磨法制备纳米晶结构TiAl基合金粉末的研究  

Investigation on Nanocrystalline TiAl Based Powders Prepared by Double-steps Ball Milling

作　　者：于宏宝[1,3] 陈玉勇[1] 张德良[2] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001 [2]怀卡托大学,新西兰哈密尔顿3105 [3]山西航天机电设备研究所,山西晋中030800

出　　处：《稀有金属材料与工程》2009年第4期686-690,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50673047)

摘　　要：以元素粉末为起始粉末,采用双步球磨法(球磨+热处理+球磨)制备TiAl基纳米晶多相结构粉末(粉末成分为Ti-47Al(at%)、Ti-45Al-2Cr-2Nb-1B-0.5Ta(at%))。采用XRD、SEM、EDS、DTA、粒度分布仪对两种粉末颗粒在球磨和热处理过程中的特性进行了表征和分析。结果表明,采用双步球磨法制备的多相结构纳米晶粉末杂质含量低,粒度分布均匀,合金元素弥散分布。一步球磨6 h获得Ti/Al均匀复合结构及实现Ti(Al)部分固溶;700℃,2 h热处理获得Ti3Al、Ti、Al3Ti、TiAl相,Al相已经消失;二步球磨实现晶粒尺寸、颗粒尺寸进一步细化。Nanocrystalline Ti-Al composite powders with composition of Ti-47Al （at%） and Ti-45Al-2Cr-2Nb-lB-0.5Ta （at%） were prepared by double-steps balll milling （ball milling＋heat treatment＋ball milling） using elemental powders. The as prepared and heat treated powders were analyzed and characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, differential thermal analysis （DTA） and particle-size distribution analyzer. The results demonstrated that high-quality composite powders with low contaminant, uniform size distribution and homogeneous elements dispersion could be obtained by the double-steps ball milling. The composite Ti/Al powders prepared by primary ball milling （6 h） were uniform. Ti3Al. Ti, AI3Ti and TiAl phases were found after heat treatment （700℃, 2 h） while Al phase disappeared. The fined grain size and particle size were further reduced by subsequent ball milling.

关 键 词：双步球磨法 高能球磨 纳米结构 Γ-TIAL基合金 

分 类 号：TB383.1[一般工业技术—材料科学与工程]