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The effect of ultrasonic melt treatment (UMT) on the microstructures and hardness of Al-Si-Cu alloy was investigated by Vickers hardness test, optical microscopy, scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy (TEM). The results show that UMT promotes the dispersion of Si phase, reduces the area fraction of secondary phase and refines grains, thereby raising the hardness of Al-Si-Cu alloy. After 2 min UMT, the hardness of T6-tempered Al-Si-Cu alloy sheet increases by 9.2% compared to that of UMT-free sheet. Quantitative TEM analysis indicates that UMT can significantly promote the precipitation of θ' phase and inhibit its rapid coarsening during the aging process, which enhances the hardness and microstructural thermal stability of Al-Si-Cu alloy.

, authors=Qianxi ZHONG, Song BAI, Zhiyi LIU, authorsList=Qianxi ZHONG, Song BAI, Zhiyi LIU, authorCompany=null, correspAuthors=Song BAI, 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=1314907223369806225, articleId=1314907221276848525, tenantId=1146029695717560320, journalId=1235980550691926019, language=CN, title=熔体超声处理对Al-Si-Cu合金组织和硬化的影响, columnId=1236276110049202322, journalTitle=矿冶工程杂志, columnName=材料, runingTitle=null, highlight=null, articleAbstract=

借助维氏硬度测试、金相显微镜、扫描电子显微镜、电子背散射衍射和透射电子显微镜等分析手段，研究了熔体超声处理对Al-Si-Cu合金组织和硬度的影响。结果表明，熔体超声处理促进了Si相的分散，降低了第二相的面积分数并细化了晶粒，有效提高了Al-Si-Cu合金的硬度；熔体超声处理2 min的T6态Al-Si-Cu合金板材硬度比未超声处理的T6态合金板材硬度提高了9.2%。定量透射分析结果显示，熔体超声处理能显著促进时效过程 θ'相的析出并抑制其快速粗化，提高了Al-Si-Cu合金的硬度和组织热稳定性。

, authors=钟千禧, 柏松, 刘志义, authorsList=钟千禧, 柏松, 刘志义, authorCompany=null, correspAuthors=柏松, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=U1cMJYd/xcZJ6zT5dN14Pw==, magXml=R77liZ/46UFfGQjFfLx1uA==, pdfUrl=null, pdf=SAOT+yl7GzCFC7jiObcp5Q==, pdfFileSize=2431449, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=pH+yRd993JYVG142cYvURA==, mapNumber=null, fund=null)}, authors=[Author(id=1314907223705350550, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1314907221276848525, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=2473990826@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314907223822791064, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1314907221276848525, authorId=1314907223705350550, language=EN, stringName=Qianxi ZHONG, firstName=Qianxi, middleName=null, lastName=ZHONG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1314907223927648665, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1314907221276848525, authorId=1314907223705350550, language=CN, stringName=钟千禧, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=中南大学材料科学与工程学院，湖南 长沙 410083, bio={"content":"

钟千禧（2000—），女，广东广州人，硕士，主要从事铝硅合金热处理工艺研究。E-mail: 2473990826@qq.com

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钟千禧（2000—），女，广东广州人，硕士，主要从事铝硅合金热处理工艺研究。E-mail: 2473990826@qq.com

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