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In this study, Cu-Ni-Sn-P (C19040) alloy strip materials with different compositions were prepared by horizontal continuous casting followed by multiple cold rolling and heat treatment processes. Effects of Sn and Ni mass fraction variations on the mechanical properties, softening resistance, and thermal contraction of Cu-Ni-Sn-P alloy strip materials were investigated. Results indicated that an increase in Sn mass fraction enhanced mechanical properties and softening resistance of Cu-Ni-Sn-P alloy through solid solution strengthening. However, excessive Sn mass fraction exacerbated Sn segregation, which worsened the thermal contraction behavior. An increase in Ni mass fraction promoted the formation of more Ni-P precipitates, significantly improving the softening resistance. When mass fraction of Sn was 1.5% and that of Ni was 0.85%, the alloy exhibited superior comprehensive properties, with a hardness of 174HV, tensile strength of 565 MPa, elongation of 4.3%, thermal contraction rate of 0.006%, and softening resistance hardness of 141HV. These properties met the requirements for lead frame materials.

, authors=Jiuhui ZHAO, Yufei LIU, Chengyi LIU, authorsList=Jiuhui ZHAO, Yufei LIU, Chengyi LIU, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1304141621092704739, articleId=1304141620312564193, tenantId=1146029695717560320, journalId=1303687303576780880, language=CN, title=Cu-Ni-Sn-P合金中Sn和Ni元素对其综合性能的影响, columnId=1304141569037198301, journalTitle=铜业工程, columnName=材料制备与加工工程, runingTitle=null, highlight=null, articleAbstract=

通过对水平连铸坯进行多道次冷轧和热处理，制备了不同成分的Cu-Ni-Sn-P（C19040）合金带材，研究了Sn和Ni元素对Cu-Ni-Sn-P合金带材力学性能、抗软化性能和热收缩性能的影响。结果表明：Sn元素的增加因固溶强化提升了Cu-Ni-Sn-P合金力学性能和抗软化性能，但加剧了Sn偏析，劣化了热收缩性能； Ni元素的增加促进形成了更多的Ni-P第二相，显著提高了抗软化性能。当Sn和Ni的质量分数分别为1.5%和0.85%时，Cu-Ni-Sn-P合金具备较高的综合性能（硬度174HV、抗拉强度565 MPa、延伸率4.3%、热收缩率0.006%、抗软化硬度141HV），能满足引线框架材料的需求。

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赵久辉（1992—），男，江西上饶人，博士，工程师，研究方向：铜加工，E-mail：1582756504@qq.com

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赵久辉（1992—），男，江西上饶人，博士，工程师，研究方向：铜加工，E-mail：1582756504@qq.com

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