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An elevated temperature Mg-Dy-Zn alloy with long period stacking ordered phase by extrusion

机译:高温Mg-Dy-Zn合金,具有通过挤压长期堆积有序相

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摘要

A Mg-2Dy-0.5Zn (at.%) alloy was prepared by casting, heat treating at 525 ℃ for 10 h, extruding at 360 ℃ and ageing at 180 ℃ for 90 h. Microstructure characterization revealed that this alloy consists of the finegrained α-Mg matrix composed nearly of the 14H long period stacking ordered (LPSO) phase and a small amount of (Mg, Zn)xDy precipitations. Tensile tests showed that the yield and ultimate tensile strengths of this alloy can reach 245 MPa and 260 MPa at 300 ℃, which are only slightly lower than those at room temperature (287 MPa and 321 MPa), the elongation of this alloy is 36% at 300 ℃, which is far higher than that at room temperature (11.6%). The high volume fraction of the 14H LPSO phase in the fine-grained a-Mg grains and the high thermal stability of the microstructure during elevated temperature deformation are responsible for the excellent elevated temperature properties observed for this alloy.
机译:铸造Mg-2Dy-0.5Zn(at。%)合金,在525℃下热处理10 h,在360℃下挤出,在180℃时效90 h。显微组织表征表明,该合金由几乎由14H长期堆积有序(LPSO)相和少量(Mg,Zn)xDy析出物组成的细晶α-Mg基体组成。拉伸试验表明,该合金在300℃时的屈服强度和极限抗拉强度分别达到245 MPa和260 MPa,仅略低于室温(287 MPa和321 MPa),伸长率为36%。在300℃时,远远高于室温(11.6%)。在高温变形过程中,细晶粒a-Mg晶粒中14H LPSO相的高体积分数和显微组织的高热稳定性是该合金观察到的优异的高温特性的原因。

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  • 来源
    《Materials Science and Engineering》 |2011年第11期|p.3609-3614|共6页
  • 作者单位

    Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;

    Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;

    Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;

    Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;

    Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;

    Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China;

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

    magnesium; mg-dy-zn alloy; microstructure; mechanical properties; long period stacking ordered phase;

    机译:镁;mg-dy-zn合金;微观结构机械性能长期堆积有序相;

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