中文摘要：

采用高能球磨和放电等离子体烧结技术制备W-4.9Ni-2.1Fe高比重合金,研究不同球磨时间对合金显微组织结构和摩擦磨损行为的影响.结果表明：当球磨时间较短（2 h）时,合金粉末中Ni、Fe元素仍以单质的形式存在;随着球磨时间的延长,Ni（Fe）溶入W晶格中形成W的过饱和固溶体,W衍射峰强度逐渐变弱,峰形明显宽化,合金试样的相对密度呈下降趋势;适量的球磨时间（24 h）,既可以保证合金中黏结相的含量和均匀分布,又不至于引入过量的杂质元素而引起合金成分改变,合金拥有最优的耐摩擦磨损性能.

英文摘要：

Tungsten heavy alloys （W-4.9Ni-2.1Fe） were successfully prepared by high-energy ball milling （HEBM） and spark plasma sintering （SPS） technique, and the influence of milling time on microstructure and friction and wear behavior were studied. The results show that the Ni and Fe elements still exists in the form of simple substance phase when the milling time is 2 h. With prolonging the milling time, Ni （Fe） dissolves into the lattice of W and forms a supersaturated solid solution of W matrix, the W phase diffraction peak becomes increasingly wider and its intensity continues to decline. At the same time, the relative density of the sample decreases. Appropriate milling time （24 h） can not only ensure the content of binding phase and its uniform distribution, but also obtain the stability of the alloy composition by not introducing too much impurity ele- ment, and thus the wear resistance property of the alloy being the best.