难熔金属及合金以其优异的性能在航空航天、电子信息、能源、化工、冶金和核工业等国防及民用领域有着不可替代的作用,其发展日益受到高度重视.本文综述了难熔金属及合金的应用和发展,以钼、钨及其合金单晶的发展历程为例,概述了难熔金属单晶的电子束悬浮区熔定向凝固制备技术的发展,简要介绍了难熔金属钼的电子束悬浮区熔定向凝固生长工艺与组织的研究.
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