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Mechanical properties, corrosion behavior and microstructures of a non-isothermal ageing treated Al-Zn-Mg-Cu alloy

机译:非等温时效处理的Al-Zn-Mg-Cu合金的力学性能,腐蚀行为和显微组织

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摘要

The mechanical properties, corrosion behavior, and microstructures of Al-Zn-Mg-Cu alloy during non-isothermal ageing (NIA) process were investigated. The results suggest that hardness and tensile strength generally keep improving with increasing ageing degree until the level of 182 HV and 578 MPa (cooled at 120 ℃, or C120), apart from a slight decline at the region where the temperature is beyond 200 ℃. Synchronously, the electrical conductivity increases and corrosion susceptibility decreases as the ageing proceeds. The optimal performance of the alloy is obtained at the C120 condition, whose electrical conductivity, stress corrosion susceptibility r_(tf)-and maximum corrosion depth are 40.3 %IACS, 98.2% and 24.7 urn, respectively. GPI rones and (η') phases are the primary ageing precipitates at the heating stage (100-210℃, 40℃/h), then (η') phases are the main ones at the cooling stage (210-100℃, 20℃/h). Reasonably, the combination of high strength and favorable corrosion resistance of the alloy through NIA treatment are associated with the growth and coarsening of intergranular precipitates during heating and newly formed fine intragranular ones during cooling.
机译:研究了Al-Zn-Mg-Cu合金在非等温时效(NIA)过程中的力学性能,腐蚀行为和显微组织。结果表明,随着温度的升高,硬度和拉伸强度通常会持续提高,直到182 HV和578 MPa(冷却至120℃或C120)为止,而温度超过200℃的区域略有下降。同步地,随着老化的进行,电导率增加,腐蚀敏感性降低。合金的最佳性能在C120条件下获得,其电导率,应力腐蚀敏感性r_(tf)和最大腐蚀深度分别为40.3%IACS,98.2%和24.7 urn。 GPI rone相和(η')相是加热阶段(100-210℃,40℃/ h)的主要老化沉淀,然后(η')相是冷却阶段(210-100℃,20)的主要老化沉淀℃/ h)。合理地讲,通过NIA处理使合金具有高强度和良好的耐腐蚀性,这与加热过程中晶间析出物的生长和粗化以及冷却过程中新形成的细晶内析出物有关。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|146-154|共9页
  • 作者单位

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China,Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Hunan, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Hunan, Changsha 410083, China;

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  • 正文语种 eng
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  • 关键词

    Al-Zn-Mg-Cu alloy; Non-isothermal ageing; Mechanical properties; Corrosion resistance;

    机译:Al-Zn-Mg-Cu合金;非等温老化;机械性能耐腐蚀性能;

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