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6082铝合金的淬火特性及微观组织研究
作者:
作者单位:

中南大学材料科学与工程学院;中南大学材料科学与工程学院

中图分类号:

TG146.2

基金项目:

广东省重大科技专项( 2009 A080205003 )


Quenching characteristics and microstructure of 6082 aluminum alloy
Author:
Affiliation:

School of Materials science and Engineering,Central South University;School of Materials science and Engineering,Central South University

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    摘要:

    采用末端淬火和中断淬火方式,结合透射电镜(TEM),研究了6082铝合金的淬火特性及微观组织变化特征。结果表明:在末端淬火试验条件下,6082铝合金的淬透深度为15-20 mm;淬火敏感区间的平均冷却速率达20 ℃/s时,合金时效后形成细小弥散的β″相,无沉淀析出带(PFZ)窄小。在中断淬火的高温保温过程中,几乎没有β平衡相的析出,时效后获得了较高的硬度;在中温保温过程中,β平衡相因消耗周围的溶质原子而快速形成并长大,导致时效后合金性能大幅度下降;低温保温过程中,β平衡相形成缓慢,随时间增加,析出数量增多并长大,影响后续时效强化效果。合金在慢冷和保温过程中,析出的β平衡相大多是以富铁相颗粒作为不均匀形核的核心,这是造成合金淬火敏感性高的原因之一。

    Abstract:

    The microstructure and quenching characteristics of 6082 aluminum alloy were investigated via end quench test, interrupted quenching method and transmission electron microscopy (TEM). The result shows that the hardenability depth of 6082 aluminum alloy is 15-20 mm, when the cooling rate was 20℃/s, plenty of fine and dispersed β″ and a narrow PFZ were formed after artificial aging. By interrupted quenching method, when the alloys were preserved at high temperature, the precipitation of β-equilibrium phase was not obvious which retained high saturated solid solution and had small effect to aging; while in the isothermal process of medium temperature, β-equilibrium phases were formed and grew up quickly by the consumption of solute atoms nearby which made a great contribution to properties loss; When the alloys were preserved at low temperature, quench induced precipitates formed slowly but grew up with the extension of time. No matter in slow cooling or isothermal process, quench induced precipitates β is prior to nucleate on the (AlFeSi) dispersoids, which is a part reason of alloy’s high quench sensitivity.

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龙社明.6082铝合金的淬火特性及微观组织研究[J].稀有金属材料与工程,2017,46(9):2553~2557.[LONG She-ming. Quenching characteristics and microstructure of 6082 aluminum alloy[J]. Rare Metal Materials and Engineering,2017,46(9):2553~2557.]
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  • 收稿日期:2015-05-29
  • 最后修改日期:2015-08-31
  • 录用日期:2015-10-13
  • 在线发布日期: 2017-11-29