铸造技术2025，Vol.46Issue(9)：910-920,11.DOI:10.16410/j.issn1000-8365.2025.5070
形变热处理工艺对Cu-3.06Ti合金组织与性能的影响
Effect of Thermomechanical Treatment on the Microstructure and Mechanical Properties of Cu-3.06 wt.％Ti Alloy
摘要
Abstract
Cu-Ti alloys are considered promising alternatives to Cu-Be alloys owing to their high strength,good workability,resource abundance and low cost.However,a trade-off between strength and electrical conductivity remains a major challenge,and conventional aging treatments often fail to achieve a balanced enhancement of both mechanical properties and electrical conductivity.A hot-forged Cu-3.06 wt.％Ti alloy was studied through three designed thermomechanical processing routes.Microhardness,tensile strength,and electrical conductivity were evaluated,along with microstructural characterization via OM,TEM,and XRD,to investigate the effects of various thermomechanical treatment conditions on the microstructure and properties of the Cu-3.06 wt.％Ti alloy.Under conventional processing route I(solution treatment+cold rolling with an 86.4％reduction+aging at 450 ℃ for 40 min),the alloy reaches a peak hardness of 327.9 HV,tensile strength of 1 110.7 MPa,and electrical conductivity of 10.55％IACS,although the precipitate size distribution is inhomogeneous.With the introduction of a two-step aging strategy,significant improvements are observed.Processing route Ⅱ(solution treatment+20％predeformation+peak-aged preaging treatment+cold rolling with an 83％reduction+aging at 400 ℃)results in a peak hardness of 367.6 HV,tensile strength of 1 293.2 MPa,and electrical conductivity of 12.87％IACS.Processing route Ⅲ(solution treatment+20％predeformation+undereaged preaging treatment+cold rolling with an 83％reduction+aging at 450 ℃)further enhances the hardness and tensile strength to 376 HV and 1 341.1 MPa,respectively,although the electrical conductivity slightly decreases to 9.20％IACS.The nanoscale metastable β'-Cu4Ti phase formed during preaging,in combination with the high dislocation density induced by cold deformation,contributed to the refinement and uniform dispersion of precipitates during the final aging process.This synergistic effect effectively enhances both the strength and electrical conductivity,offering a viable pathway for the comprehensive performance optimization of Cu-Ti alloys.关键词
Cu-Ti合金/热处理工艺/预时效/时效强化/性能Key words
Cu-Ti alloy/heat treatment process/preaging treatment/age hardening/properties分类
矿业与冶金引用本文复制引用
李婧婷,郭春文,王锦程,赵红亮,张书亚,范宇恒,董祥雷..形变热处理工艺对Cu-3.06Ti合金组织与性能的影响[J].铸造技术,2025,46(9):910-920,11.基金项目
国家重点研发计划(2023YFB3710001) （2023YFB3710001）
凝固技术国家重点实验室开放课题(SKLSP202405) （SKLSP202405）
