深过冷Co-20at%Ru合金包晶相的析出与演化规律（英文）
发布时间：2018-08-08 16:57
【摘要】：通过深过冷凝固实验对Co-Ru包晶合金中不同相的析出及演化行为进行了研究。采用熔融玻璃净化与循环过热相结合的方法对该合金的深过冷实验获得了217 K(0.12 T L)的最大过冷度。结合经典形核理论的计算结果,在全过冷度范围内ξ相始终作为先析相优先从熔体中析出。当过冷度(ΔT)小于临界过冷度(ΔT*≈180 K)时,合金凝固组织表现为典型的包晶组织,此时包晶相的析出依赖于ξ相的形态改变;当ΔTΔT*时,虽然ξ相仍为先析相,但是包晶相α的析出不再依赖于ξ相,而是直接从过冷熔体中析出并与ξ相竞争长大。随着过冷度的增大,包晶相的相对含量先增加后减少最后再次增加。
[Abstract]:The precipitation and evolution of different phases in Co-Ru peritectic alloy were studied by cryogenic solidification experiment. The maximum undercooling degree of 217K (0.12 T L) was obtained by the method of melting glass purification and cyclic overheating. Based on the calculation results of classical nucleation theory, 尉 phase is always precipitated from melt as the first phase in the range of total undercooling. When the undercooling degree (螖 T) is less than the critical undercooling degree (螖 T * 鈮，
本文编号：2172429
[Abstract]:The precipitation and evolution of different phases in Co-Ru peritectic alloy were studied by cryogenic solidification experiment. The maximum undercooling degree of 217K (0.12 T L) was obtained by the method of melting glass purification and cyclic overheating. Based on the calculation results of classical nucleation theory, 尉 phase is always precipitated from melt as the first phase in the range of total undercooling. When the undercooling degree (螖 T) is less than the critical undercooling degree (螖 T * 鈮，
本文编号：2172429
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