CAJ | 학술논문

本文以典型析出强化型Cu-0.88Cr合金为研究对象，通过大变形量多道次连续拉拔变形试验，对比研究了Cu-0.88Cr合金和纯铜拉拔过程中的抗拉强度和延伸率变化规律，揭示了第二相对铜合金组织和性能的影响。结果表明：Cu-0.88Cr合金的抗拉强度随着变形量的增大呈现先升高后降低的趋势，当应变为0.7时，抗拉强度达到最大值475 MPa。纯铜抗拉强度随变形量的增加先增大后基本保持不变。当应变为4.9时抗拉强度与纯铜接近。微观组织观察表明：未变形时，第二相与铜基体界面关系为共格界面。随着变形量的增大，第二相与基体的界面关系由共格界面向非共格界面发生转变，从而导致 Cu-0.88Cr合金的抗拉强度在应变大于0.7时呈下降趋势。Cu-0.88 Cr合金变形过程中延伸率低于纯铜，且在开始变形后随变形量增加变化不大，分析表明第二相存在降低了延伸率，但第二相与铜基体界面关系的转变对延伸率影响不明显。
본문이전형석출강화형Cu-0.88Cr합금위연구대상，통과대변형량다도차련속랍발변형시험，대비연구료Cu-0.88Cr합금화순동랍발과정중적항랍강도화연신솔변화규률，게시료제이상대동합금조직화성능적영향。결과표명：Cu-0.88Cr합금적항랍강도수착변형량적증대정현선승고후강저적추세，당응변위0.7시，항랍강도체도최대치475 MPa。순동항랍강도수변형량적증가선증대후기본보지불변。당응변위4.9시항랍강도여순동접근。미관조직관찰표명：미변형시，제이상여동기체계면관계위공격계면。수착변형량적증대，제이상여기체적계면관계유공격계면향비공격계면발생전변，종이도치 Cu-0.88Cr합금적항랍강도재응변대우0.7시정하강추세。Cu-0.88 Cr합금변형과정중연신솔저우순동，차재개시변형후수변형량증가변화불대，분석표명제이상존재강저료연신솔，단제이상여동기체계면관계적전변대연신솔영향불명현。
With this paper taking precipitation strengthening of Cu-0.88Cr alloy as the research object,andby comparing the changing laws of tensile strength,elongation of copper and Cu-0.88Cr during deep wire drawing,the influence of second phase on microstructure and properties of copper and Cu-0.88Cr is indicated.The results show that:the tensile strength of Cu-0.88Cr al-loy increases at first and then decreases as the true strain increases.When the true strain is 0.7, tensile strength reaches a maximum of 475 MPa.The tensile strength of copper increases at first and then remaines almost constant when the true strain increases.When the true strain is 4.9, the tensile strength of Cu-0.88Cr alloy is close to that of copper.Microstructure observations in-dicate that the interface relationship between second phase and matrix of Cu-0.88Cr alloy is co-herent before wire drawing,With an increase in the deformation,the interface relationship grad-ually changes from coherent relationship to incoherent relationship,leading to a decrease in ten-sile strength,whereby that the elongation of Cu-0.88Cr alloy is smaller than copper during draw-ing,and remaines almost constant when the true strain increases.Microstructure observations show that existence of second phase decreases the material plasticity,but the change of interface relationship between second phase and matrix Cu-0.88Cr alloy has no obvious effect on it.