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›› 2014, Vol. 14 ›› Issue (5): 880-885.

• 材料工程专栏 • 上一篇    下一篇

超重力对Al-6%Cu合金凝固组织的影响

贾树建 宋波 宋高阳 杨玉厚 黄传根   

  1. 北京科技大学钢铁冶金新技术国家重点实验室 清华大学化学工程系 北京科技大学机械工程学院热能系 北京科技大学机械工程学院热能系 北京科技大学机械工程学院热能系
  • 收稿日期:2014-09-05 修回日期:2014-10-08 出版日期:2014-10-20 发布日期:2014-10-20
  • 通讯作者: 贾树建

Effect of Super-gravity Field on Solidification Structure of Al-6%Cu Alloy

JIA Shu-jian YU Bo SONG Gao-yang YANG Yu-hou Chuan-gen   

  1. State Key Lab. of Advanced Metallurgy, University of Science and Technology Beijing Department of Chemical Engineering, Tsinghua University State Key Lab. of Advanced Metallurgy, University of Science and Technology Beijing State Key Lab. of Advanced Metallurgy, University of Science and Technology Beijing State Key Lab. of Advanced Metallurgy, University of Science and Technology Beijing
  • Received:2014-09-05 Revised:2014-10-08 Online:2014-10-20 Published:2014-10-20
  • Contact: JIA Shu-jian

摘要: 利用离心旋转加热炉研究了超重力对Al-6%Cu合金凝固组织细化及析出相形貌的影响. 结果表明,超重力场可细化晶粒,在常重力条件下(重力系数G=1),初生铝相主要为粗大的等轴晶,晶粒直径为112 mm;在超重力条件下,当G分别为100, 300, 500和700时,晶粒直径分别减小为85, 77, 70和63 mm,晶粒细化,且超重力越大晶粒细化越明显. 超重力场可改善Al2Cu析出相的形貌,有效提高合金性能,G=1时Al2Cu相主要为粗大的不规则块状,合金硬度为59.9 MPa;当G分别为100, 300, 500和700时,Al2Cu相逐渐转变为细小的块状和球状,硬度分别增大为68.4, 73.2, 74.4和74.9 MPa,且超重力越大,Al2Cu相越细小、致密,合金的硬度也越高.

关键词: 超重力, Al-6%Cu, 晶粒细化, 析出相, 硬度

Abstract: The effect of super-gravity on the refining of solidification structure and morphology of Al2Cu in Al-6%Cu alloy was studied by selecting the central part of the sample after processing by a centrifugal high temperature furnace. The results showed that the grains could be refined under super-gravity field. Al primary crystals in the alloy were the bulky equiaxed crystals with a diameter of 112 mm under the gravity coefficient G=1, and the grain diameter decreased to 85, 77, 70 and 63 mm as the gravity coefficient G increased to 100, 300, 500 and 700, respectively, indicating that the grain was remarkably refined as G increased. Moreover, super-gravity field could improve the morphology of Al2Cu precipitates and the properties. Al2Cu precipitates were bulky irregular block and the value of hardness was 59.9 MPa under G=1, and then they transformed into tiny lump and spheres gradually as G increased to 100, 300, 500 and 700, respectively. As a result, the value of hardness increased to 68.4, 73.2, 74.4 and 74.9 MPa, respectively. Smaller and denser Al2Cu precipitates formed as the super-gravity increased, which also improved the hardness of the alloy.

Key words: super-gravity, Al-6%Cu, grain refining, precipitate, hardness

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