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Effect of Ablation Casting on Microstructure and Casting Properties of A356 Aluminium Casting AlloyV. Bohlooli1,M. Shabani Mahalli1,S. M. A. Boutorabi21. Casting Research Center, School of Metallurgy... quality. In this study, the effects of processing variables on the porosity content, microstructure and feedability of A356 casting alloy were investigated. Secondary dendrite arm spacing (SDAS......
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and the microstructural coarsening of the SIMA processed 7075 Al alloy were discussed and confirmed. Key words: thixoforming; thermomechanical processing; aluminium alloys; semi-solid metal 1 Introduction... Processing of Alloys and Composites, Aachen, Germany, 2008. [16] VANEETVELD G, RASS?L? A, P?ERRET J C, LECOMTE- BECKERS J. Extrusion tests of 7075 aluminium alloy at high solid fraction [J]. Int J......
Zr含量对大应变轧制2524铝合金板材微观组织及力学性能的影响王松辉,孙有平,陶德福,何江美,李旺珍广西科技大学机械工程学院摘 要:采用光学显微镜(OM),透射电镜(TEM),X射线衍射(XRD)和拉伸试验机等研究了Zr含量对2524铝合金显微组织及力学性能的影响.结果表明:添加Zr元素能够明显细化铸态2524铝合金的晶粒.铸态合金存在明显的枝晶偏析,经过均匀化退火处理后,非平衡低熔点相基本溶入基体,晶间组织分布趋于均匀.大应变轧制变形后,2524铝合金中均得到了典型的纤维状组织,合金中的第二相主要为S(Al2CuMg)相,θ(Al2Cu)相,T(Al20Cu2Mn3)相和Al3Zr相,并沿晶界呈连续分布.经时效处理后,形成大量弥散的Al3Zr粒子,对位错和亚晶界具有强烈的钉扎作用,能明显提高合金的抗......
of the carbon fibre reinforced aluminium matrix composite was investigated. The results show that component elements Si and Cu diffuse into the base metal. The infiltrated filler alloy, the aluminium base and the carbon fibre react to produce many interfacial phases like Al4C3, SiC and CuAl2. The bond between the filler and the aluminium base is perfect. Using the Al-28Cu-6Si and Al-4Cu-10Si filler alloy......
2524铸态合金均匀化过程中微观组织的变化范光华,刘志义,柏松,赵齐,李俊霖中南大学材料科学与工程学院摘 要:在不同温度和不同保温时间条件下对2524铸态合金进行均匀化处理,利用扫描电镜(SEM),透射电镜(TEM),差示扫描量热法(DSC)和金相显微镜(OM)等,研究2524铸态合金在均匀化过程中微观组织的变化,并分析在不同的均匀化处理状态下T相(即Al20Cu2Mn3相)的析出情况.结果表明:2524铸态合金中存在严重的枝晶偏析,大量的非平衡共晶相连续地沿晶界分布,主要的第二相为Al2Cu和Al2Cu Mg;主要合金元素不同程度地富集在晶界,富集程度为Cu>Mg>Mn;最佳的均匀化处理制度为500℃/48 h,均匀化处理后,Al2Cu和Al2Cu Mg基本回溶至基体,只余少量难溶的Al......
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高强度织构对2524铝合金疲劳性能的影响鲁璐青,刘志义,夏鹏中南大学材料科学与工程学院摘 要:对分别含有高强度高斯织构和高强度立方织构状态的2种2524-T4铝合金板材的疲劳裂纹扩展速率和短裂纹扩展行为进行研究,用扫描电镜(SEM)观察疲劳试样断口形貌和疲劳短裂纹的扩展路径,研究织构类型对合金疲劳性能的影响...金具有更好的疲劳性能.关键词:2524铝合金;高斯织构;立方织构;疲劳裂纹扩展抗力;疲劳损伤容限;......
Droplet transition for plasma-MIG welding on aluminium alloys BAI Yan(白 岩)1, GAO Hong-ming(高洪明)2, QIU Ling(邱 灵)3 1. Institute for Welding and Surface Technology of R&D Center, Baoshan Iron... penetration. Key words: plasma MIG welding; droplet transition; aluminum alloy; high speed photography 1 Introduction The plasma-MIG welding process, first invented and studied in Philips Research......