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NaF-NaCl-KCl熔盐体系中铝热还原法制备Al-Sc合金甘培原,张建飞,刘东梅,谢营邦,詹海鸿,刘晨广西冶金研究院摘 要:在Na F-NaCl-KCl熔盐体系熔融状态下,用铝热法还原氟化钪制备出钪含量2.37%8.13%的铝钪合金.引入金属间化合物Al3Sc作为生成物对反应式进行修正,热力学计算结果表明...时间对钪回收率的影响最小,延长保温时间能少量提高回收率,超过1h后回收率不再上升.关键词:NaF-NaCl-KCl熔盐;Al-Sc合金;ScF3;Al3Sc;热力学;......
复合添加微量Sc,Zr对Al-Zn-Mg-Cu合金组织性能的影响 游江海1,贺永东1,张新明1 (1.中南大学,湖南,长沙,410083) 摘要:研究了微量Sc,Zr对Al-Zn-Mg-Cu合金组织性能的影响.结果表明:单独添加0.18%Zr,合金抗拉强度和延伸率明显低于单独添加0.18%Sc,但再结晶抑制效果优于单独添加0.18%Sc.复合添加Sc,Zr较单独添加Sc或Zr具有更好的晶粒细化作用,较强的固溶强化作用和再结晶抑制效果.在Zr含量一定的条件下,合金强度和延伸率随Sc添加量增加而提高.强度和延伸率增加与所析出的LI2结构的Al3Sc,Al3(Sc,Zr)粒子钉扎位错和亚结构,......
性能,并削弱Al3Sc的弹性各向异性特征.此理论研究指出,微合金化Zr和Sc的共同添加且Sc/Zr比不大于1/3时,可以保证细化效果并大大降低合金的成本.关键词:细化相;形成焓;弹性性质;界面性能;Al3(Zr, Sc);......
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decomposes to form a fine dispersion of homogeneously nucleated, equilibrium precipitates of a stable L12 phase, Al3Sc, which can produce a significant age hardening [5]. Moreover, the Al3Sc dispersoids can..., which indicates that they are formed by continuous precipitation other than discontinuous precipitation such as precipitation of Al3Sc and Al3Zr in some Al-Sc [16] and Al-Zr [17] alloys. The average......
of the above good properties is that the main existing form of Er in aluminum alloy is Al3Er, which is characterized as higher melting-point and good stability for its special structure. Just as Al3Sc......
定相的电子结构,分析其成键情况,并采用基于第一性原理的热力学计算公式,计算各相的生成焓,结合能,德拜温度,体弹模量和自由能.结果表明:Al-Sc金属间化合物在费米面以下,主要通过Al 3s-Sc 3d和Al 3p-Sc 3d杂化成键,在费米面以上则以Sc 3d成键为主;随着Al在各相中所占比例的增大,体系中共价性增大,稳定性提高,且Al2Sc与Al3Sc在低能级区成键电子较多,结构较为稳定.在4个... by electrons of Sc 3d. As the Al content increases, the covalent and stability of the system increase, and Al2Sc and Al3Sc are the stable structures by the more bonding electrons in low-energy area. Among......
, 45: 1883-1891. [19] JONES M J, HUMPHREYS F J. Interaction of recrystallization and precipitation: The effect of Al3Sc on the recrystallization behaviour of deformed aluminium [J]. Acta Materialia......
] CAVANAUGH M K, BIRBILIS N, BUCHHEIT R G, et al. Investigating localized corrosion susceptibility arising from Sc containing intermetallic Al3Sc in high strength Al-alloys[J]. Scripta Materialia......
, 1996, 44(11): 4447-4462. [41] JONES M, HUMPHREYS F. Interaction of recrystallization and precipitation: The effect of Al3Sc on the recrystallization behaviour of deformed aluminium [J]. Acta......