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本文对一种氧化物弥散强化镍基高温合金的机械合金化工艺、过程及原理进行了研究。研究表明,用Cr-Ni-Al-Ti-Zr-B中间合金来代替现行的、采用多种中间合金的选配方案,可以同样获得机械合金化的效果,并能最终实现γ′沉淀相及Y_2O_3弥散相在同一合金中的均匀分布。机械合金化是在保护气氛下将各种原始粉末在高能球磨机中反复冷焊-破碎过程,以获得含有弥散质点的机械固溶体粉末。X光和扫描电镜分析表明,在“机械固溶体”中各种元素已基本合金化,同时也存在一定的微区成分偏离,但可以通过改进合金化工艺及热挤压和热处理来消除。本文也对影响机械合金化的因素进行了分析。
In this paper, the mechanical alloying process, process and principle of a kind of oxide dispersion strengthening nickel base superalloy were studied. The results show that the mechanical alloying effect can be obtained in the same way with the existing Cr-Ni-Al-Ti-Zr-B master alloy instead of the existing one. Y_2O_3 dispersed phase in the same alloy uniform distribution. Mechanical alloying is in the protective atmosphere of the original powder in the high-energy ball mill repeated cold welding - crushing process to obtain the dispersion of particles containing the mechanical solid solution powder. X-ray and SEM analyzes show that the various elements in the “mechanical solid solution” have been basically alloyed, and there is also a certain deviation of the micro-composition, but can be eliminated by improving the alloying process and hot extrusion and heat treatment. This article also analyzes the factors that affect mechanical alloying.