采用电磁悬浮法使Cu40 Co30 Cr3o的合金熔体达到深过冷,发现深过冷条件下合金很容易发生亚稳液相分离,同时冷却速率显著影响着样品的微观组织.经悬浮冷却凝固的样品发生液相分离,富Cu相中出现富(Co,Cr)相枝晶,富(Co,Cr)相中形成二次析出的富Cu相.在电磁搅拌作用影响下,二次析出的富Cu相呈椭球状.在用纯铜快淬的条件下,凝固后的微观组织更加细化,样品为一相以球状均匀弥散在另一相中,并且在富Cu相中发生了多次析出的现象.XRD结果表明,在两种实验条件下均发现Cu相和CoCr相的存在,说明不同的冷却速率对相组成基本没有影响.与Cu-Co-Fe和Cu-Co-Ni比较,Ct-Co-Cr发生液相分离所需要的过冷度和冷却速率更小,进行得更为彻底.
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