摘要
研究了时效温度和时效时间对不同冷变形条件下Cu-2.0Ni-0.5Si合金组织和性能的影响。结果表明,合金经900℃固溶,在经不同冷变形后时效,第二相呈弥散分布,当变形量为80%,时效温度为500℃,时效时间为1h时,其显微硬度HV达到250,电导率达到22.625MS/m,与未经过预冷变形的合金时效相比,合金能获得较高的显微硬度与电导率。时效前的预冷变形能够有力的促进合金在时效过程中第二相的析出,从而提高合金的显微硬度和电导率。合金经40%预冷变形,450℃×4h时效后,其抗拉强度达到620MPa。拉伸试样断口表现出明显的塑性断裂特征。
Effects of aging temperature and aging time on microstructure and properties of Cu-2Ni-0.5Si alloy were investigated after varying cold deformation. The results indicate that the secondary phase is dispersively distributed in the alloy with solid solution at 900 ℃ and then aging treatment after varying cold deformation. The micro-hardness and electronic conductivity of the 80% deformed alloy with aging at 500 ℃ for 1h are 250 and 22.625 MS/m, respectively, exhibiting higher comprehensive properties compared with those without cold deformation. Pre-cold deformation before aging can strongly accelerate the precipitation of secondary phase in the alloy during aging, which is responsible for the improvement of micro-hardness and electronic conductivity. The tensile strength of the 40% pre-cold deformed alloy with aging at 450 ℃ for 4 h can reach up to 620 MPa, and the fracture morphology is characterized by typical ductile fracture mode.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第10期810-813,共4页
Special Casting & Nonferrous Alloys
基金
国家高技术研究发展计划(863计划)资助项目(2006AA03Z528)
国家自然科学基金资助项目(50571035)
河南省杰出青年基金资助项目(0521001200)
