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通过机械球磨法制备原子比为4:1的Cr-W预合金粉末,对球磨后的Cr-W粉末进行XRD、SEM、TEM分析,探讨球磨时间对Cr-W粉末形貌、晶粒大小、组织结构及烧结Cr-W合金固溶度的影响。结果表明:采用机械合金化法,可以制备纳米级的Cr-W预合金粉末;球磨初期,晶粒尺寸、微应变变化较大,48h后趋于稳定获得小于30nm的纳米晶粉末;经72h球磨后,粉末中有固溶体形成;球磨过程伴随着晶格常数的变化;球磨时间越长的粉末,烧结后各相分布越均匀,固溶程度越高。
The Cr-W pre-alloyed powders with the atomic ratio of 4: 1 were prepared by mechanical ball milling. The Cr-W powders after milling were characterized by XRD, SEM and TEM. The effects of milling time on the morphology, grain size, Structure and Sintered Cr-W Alloy Solubility. The results show that the nanocrystalline Cr-W pre-alloyed powders can be prepared by mechanical alloying method. At the initial stage of ball milling, the grain size and micro-strain change greatly, and the nanocrystalline powders less than 30nm are stable after 48h. After the solid solution is formed in the powder, the ball milling process is accompanied by the change of the lattice constant. The longer the ball milling time, the more evenly the phases are distributed and the higher the degree of solid solution.