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高强度Cu-Ni-Si-(Ti)合金的组织与性能
Rare Metals
(
IF
9.6
)
Pub Date : 2021-02-25
, DOI:
10.1007/s12598-020-01699-5
Yi-Hai Yang
,
Sheng-Yao Li
,
Zhen-Shan Cui
,
Zhou Li
,
Yun-Ping Li
,
Qian Lei
摘要
高强度Cu-Ni-Si合金中强度和断裂伸长率之间的权衡成为最近的一个热门研究课题。Cu-Ni-Si-(Ti) 合金在真空感应熔炼炉中制备,以研究钛对不同热机械处理的 Cu-Ni-Si 合金显微组织和机械性能的影响。经 900°C 均质化 4 h,热轧 80%,970°C 固溶 2 h,冷轧 50%,最后在 450°C 时效 180 min,所研究的 Cu-10Ni –Si-2Ti 合金硬度达到 HV 252.4,电导率 23.6% IACS,抗拉强度 764.4 MPa,屈服强度 622.26 MPa,断裂伸长率 10.4%,强度-伸长率积 7.95 GPa%,低于与所研究的 Cu-10Ni-2Si 合金相比。Ti的加入有助于细化显微组织,抑制峰值硬化后力学性能的下降趋势,并在Cu-Ni-Si合金中引起主要亚结构强化机制而不是沉淀强化。这些发现为理解 Ti 对 Cu-Ni-Si 系合金的影响提供了重要的理解,并且设计的具有高强度和断裂伸长率的 Cu-Ni-Si 合金可以满足电子和电气行业的一些要求。
图形摘要
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Microstructure and properties of high-strength Cu–Ni–Si–(Ti) alloys
Abstract
The tradeoff between the strength and the fracture elongation in the high-strength Cu–Ni–Si alloy became a hot research topic recently. Cu–Ni–Si–(Ti) alloys were fabricated in a vacuum induction melting furnace to study the effects of titanium on the microstructure and mechanical properties of Cu–Ni–Si alloys with different thermo-mechanical treatments. After homogenization at 900 °C for 4 h, hot-rolled by 80%, solution treatment at 970 °C for 2 h, cold-rolled by 50%, and finally aged at 450 °C for 180 min, the studied Cu–10Ni–Si–2Ti alloy achieved the hardness of HV 252.4, electrical conductivity of 23.6% IACS, tensile strength of 764.4 MPa, yield strength of 622.26 MPa, fracture elongation of 10.4%, and strength-elongation product of 7.95 GPa%, which are less than those of the studied Cu–10Ni–2Si alloy. The addition of Ti contributed to refining the microstructure, suppressing the decreasing trend in mechanical properties after peak hardening, and arousing a primary substructure strengthening mechanism rather than the precipitation strengthening in Cu–Ni–Si alloys. These findings provide essential understandings of the effects of the Ti on Cu–Ni–Si system alloys, and the designed Cu–Ni–Si alloys with high-strength and fracture elongation could fulfill some requirements of the electronic and electrical industry.
Graphic abstract
更新日期:2021-02-25