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Microstructure and mechanical properties of 7055 Al alloy prepared under different sintering conditions using powder by-products

机译：使用粉末副产物在不同烧结条件下制备的7055 Al合金的微观结构和机械性能

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摘要

To efficiently reuse the powder by-products produced during the production of the spray-formed 7055 alloy, a 7055 aluminum alloy was prepared by traditional powder metallurgy by using powder by-products as the raw materials. In addition, characteristics of the powder by-products and effects of the sintering conditions on the microstructure and properties of the 7055 Al alloy are investigated. The densiflcation mechanism of the powder by-products during sintering is revealed. The results indicated that the existence of an oxide layer on the particle surface of the powder by-product as well as pores inside the particles. The shrinkage and densiflcation of the sintered body during vacuum sintering is hindered by the oxide layer, and lead to a low relative density and strength. However, the shrinkage and the densification of sintered body are promoting by the fracture of oxide layer under the pressure during hot-press sintering, and result in a high relative density and strength. At a temperature of 550 °C, a pressure of 12 MPa, and a holding time of 120 min, the as-sintered 7055 alloy with the relative density of 99.70% and the ultimate tensile strength of 277.72 MPa are obtained.
机译：为了有效地重复使用在喷涂形成的7055合金期间产生的粉末副产物，通过使用粉末冶金作为原料，通过传统的粉末冶金制备7055铝合金。另外，研究了粉末副产物的特征和烧结条件对7055Al合金的微观结构和性能的影响。揭示了烧结过程中粉末副产物的致密化机制。结果表明，在粉末副产物的颗粒表面和颗粒内部的孔中存在氧化物层。在真空烧结期间烧结体的收缩和致密化由氧化物层阻碍，导致相对密度和强度低。然而，烧结体的收缩和致密化通过在热压烧结期间的压力下通过氧化物层的破裂而促进，并导致高相对密度和强度。在550℃的温度下，12MPa的压力和120分钟的保持时间，获得相对密度为99.70％的烧结7055合金，并且获得了277.72MPa的最终拉伸强度。

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  • 来源
    《Materials Science and Engineering》 |2021年第23期|140562.1-140562.14|共14页
  • 作者

    Tao Wang; Yufeng Huang; Lun Yang; Yunzhu Ma; Chao Liu; Lei Wu; Huanyuan Yan; Xinyue Zhao; Wensheng Liu;

  • 作者单位

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

    National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials Central South University Changsha 410083 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Aluminum alloy; Hot-press sintering; Microstructure; Mechanical properties; Densification mechanism;

    机译：铝合金;热压烧结;微观结构;机械性能;致密化机制;

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