深过冷Cu50Ni50合金力学性能和抗腐蚀性能

Mechanical Properties and Corrosion Resistance of Undercooled Cu50Ni50 Alloy

采用熔融玻璃净化和循环过热相结合的方法研究过冷 Cu5 0 Ni5 0合金的力学性能和抗腐蚀性能变化规律。结果表明 :在小过冷区间 ,合金力学性能取决于快速凝固阶段枝晶的重熔程度。中等过冷区间 ,过冷度越大 ,力学性能越高 ,ΔT=192 K时的伸长率 δ、屈服强度 σ0 .2 和极限抗拉强度 σb分别是 ΔT=6 6 K时的 5 .9倍、1.6 7倍和 3.2 6倍。当 ΔT>192 K后 ,力学性能有所降低。过冷度对合金抗腐蚀性能的影响主要表现在对凝固组织成分均匀性的影响 ,过冷度越大 。

By using molten glass purification and superheating cycling,mechanical properties and corrosion resistance of undercooled Cu50Ni50 alloy were studied.Results showed that within small undercooling range,the mechanical properties were related to the remelting degree of primary dendrites.When the undercooling higher than 66 K,the mechanical properties improved steadily,and the elongation,0.2% yield strength and ultimate tensile strength of the structure of 192 K were 5.9,1.67 and 3.26 times,respectively,as high as those with the structure of 66 K.When the undercooling higher than 192 K,the mechanical properties decreased slightly.The corrosion resistance improved with the increase of undercooling and stablilzed when the undercooling higher than 192 K.