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Low-cycle fatigue behavior of a cast Mg-Y-Nd-Zr alloy by T6 heat treatment

机译:T6热处理Mg-Y-Nd-Zr铸造合金的低周疲劳行为

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摘要

Strain controlled low-cycle fatigue (LCF) tests of a cast Mg-3.5Y-2.4Nd-0.5Zr alloy by two different T6 heat treatment (T6_0: solution at 525 ℃ for 4 h and then aging at 225 ℃ for 34 h; T6_1: conditional industrial T6 heat treatment - solution at 520 ℃ for 8 h and aging at 225 ℃ for 16 h) were studied at room temperature under different total strain amplitudes. And theirs fatigue parameters, fatigue lives and failure behaviors after cyclic loading were evaluated. At relatively low total strain amplitudes (0.3-0.45%), the T6_0 alloy presented basically cyclic stabilization; and the T6_1 alloy was increasing hardening until failure. While at higher total strain amplitudes (0.45-0.9%), both them showed hardening through the entire LCF testing. Fatigue cracks of the alloy initiated from the specimen surface, the fracture surfaces became more rough and concavo-convex as the strain amplitude increased. Due to the fine and dense precipitates, the T6_0 alloy showed the super fatigue properties. And the alloy after T6_0 heat treatment obtained a distinctly longer fatigue life than that of the alloy treated under T6, condition at any given total strain amplitude.
机译:Mg-3.5Y-2.4Nd-0.5Zr铸造合金通过两种不同的T6热处理(T6_0:在525℃固溶4 h,然后在225℃时效34 h进行应变控制的低周疲劳(LCF)测试; T6_1:有条件的工业T6热处理-在室温下以不同的总应变幅度研究了520℃下的溶液8 h和225℃下的老化16 h)。并评估了它们的疲劳参数,疲劳寿命和循环载荷后的失效行为。在相对较低的总应变幅度(0.3-0.45%)下,T6_0合金呈现出基本的循环稳定性。 T6_1合金一直在增加硬化直到失效。在较高的总应变幅度(0.45-0.9%)下,它们在整个LCF测试中均显示出硬化。合金的疲劳裂纹从试样表面开始,随着应变幅度的增加,断裂表面变得更加粗糙和凹凸不平。由于细小且致密的析出物,T6_0合金表现出超强的疲劳性能。而且,在任何给定的总应变幅度下,T6_0热处理后的合金比在T6条件下处理的合金具有明显更长的疲劳寿命。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第31期|377-384|共8页
  • 作者单位

    School of Materials Science and Engineering, Central South University, Changsha 410083, China,State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

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

    School of Metallurgy and Environment, Central South University, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, China,State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

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

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

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnesium alloy; Low-cycle fatigue; Heat treatment; Fracture; Precipitate;

    机译:镁合金低周疲劳;热处理;断裂;沉淀;

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