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Increasing toughness by promoting discontinuous precipitation in Cu-Ni-Si alloys

机译:通过促进Cu-Ni-Si合金中的不连续沉淀,提高韧性

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摘要

The influence of precipitation morphology, including continuous precipitation (CP) and discontinuous precipitation (DP), on the mechanical behaviour of Cu-Ni-Si alloys was studied. The Cu-6Ni-1.5Si (in wt%) alloy was solution heat treated at 980 degrees C for 2h and aged at 500 degrees C for 0.5 and 3h to produce CP and DP structures. The DP specimen showed an abnormal increase in tensile ductility with increasing strain rate, unlike the CP counterpart. The impact toughness of the DP specimen was 1.6 times greater than that of CP specimen. The fracture mode in DP specimen was mostly dimpled rupture, while the mixed mode of cleavage fracture and dimpled rupture was noted on the CP specimen.
机译:研究了沉淀形态,包括连续沉淀(CP)和不连续沉淀(DP)的影响,对Cu-Ni-Si合金的力学行为进行了研究。 Cu-6Ni-1.5Si(WT%)合金是在980℃处理2小时的溶液热,500℃,0.5和3H,以产生CP和DP结构。 与CP对应物不同,DP样本表明,随着应变率的增加,拉伸延展性的异常增加。 DP样本的冲击韧性比CP样本大的1.6倍。 DP样本中的断裂模式大致破裂,而在CP样本上注意到裂解骨折和凹陷破裂的混合模式。

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