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Research on multi functional Cu-Cr-Zr alloys in mechanical and electrical properties produced by controlling its nano-structure

纳米结构控制多功能Cu-Cr-Zr合金力学电性能研究

基本信息

批准号：
15560604
负责人：
KITAGAWA Kazuo
金额：
$ 2.05万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560604/
关键词：
ultrafine grain ECAP process Cu-Cr-Zr alloy mechanical property electrical property multi function thermal stability ナノ結晶粒

项目摘要

This research has been conducted to produce the excellent Cu alloy in combination with good electrical conductivity and mechanical properties by controlling its nano-structure.1.The ultrafine grain (UFG) Cu-Cr and Cu-Cr-Zr dilute alloys with different concentrations of alloying elements have been fabricated by ECAP (Equal Channel Angular Pressing), and followed by heat treatment.(1)The post ECAP aging makes the precipitation hardened ultrafine grain structure rather stable under both thermal and mechanical influence.(2)Optimal aging conditions are found to ensure the best high cycle fatigue performance in combination with good electric conductivity, strength and ductility.(3)The significant improvement of tensile and HFC properties observed together with improvement in ductility if compared to ordinal Cu-Cr-Zr alloys fabricated by cold working and heat treatment.2.The ultra fine grain Cu-0.36Cr alloy was fabricated by multiple ECAP with different strain path, aiming at fabrication of UFO structures with different structures.(1)ECAP has been capable of producing high strength UFG materials having a considerable amount of uniform deformation.(2)The tensile strength and high cycle fatigue properties are just slightly affected by the strain path, grain shape and crystallographic texture of ECAP specimens.3.The fracture and fatigue resistance of ultrafine grain Cu-Cr-Zr alloy produced by ECAP was investigated.(1)The fatigue crack growth behavior is independent of the specimen orientation, proving the ECAP create a uniform structure with rather isotropic properties.

本研究通过控制其纳米结构，生产出兼具良好导电性和力学性能的优良铜合金。1.采用ECAP（等通道角压制）技术制备了不同合金元素浓度的超细晶（UFG）Cu-Cr和Cu-Cr-Zr稀合金，并进行热处理。（1）ECAP后时效使沉淀硬化超细化。晶粒结构在热和机械影响下相当稳定。(2)最佳时效条件确保了最佳的高周疲劳性能，同时具有良好的导电性、强度和延展性。(3)与冷加工和热处理制备的普通 Cu-Cr-Zr 合金相比，拉伸和 HFC 性能显着改善，延展性也有所改善。2.超细晶粒 Cu-0.36Cr 合金采用不同应变路径的多次ECAP制备，旨在制作不同结构的UFO结构。(1)ECAP已能够制备具有相当量均匀变形的高强度UFG材料。(2)ECAP试件的拉伸强度和高周疲劳性能受应变路径、晶粒形状和晶体织构的影响较小。3.超细晶粒的断裂和抗疲劳性能对ECAP生产的Cu-Cr-Zr合金进行了研究。(1)疲劳裂纹扩展行为与试样方向无关，证明ECAP产生了具有相当各向同性性能的均匀组织。