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首页> 外文期刊>Materials Science and Engineering >Dynamic microstructural changes during hot extrusion and mechanical properties of a Mg-5.0 Zn-0.9 Y-0.16 Zr (wt.%) alloy
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Dynamic microstructural changes during hot extrusion and mechanical properties of a Mg-5.0 Zn-0.9 Y-0.16 Zr (wt.%) alloy

机译：Mg-5.0 Zn-0.9 Y-0.16 Zr（wt。％）合金热挤压过程中的动态微观结构变化和力学性能

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摘要

In this study, firstly, dynamic microstructural changes of an as-cast Mg-5.0 Zn-0.9 Y-0.16 Zr (wt.%) alloy (designated ZWK510) during hot extrusion at 350℃ and a ram speed of 3.33 mms~(-1) was systematically investigated by electron backscattering diffraction (EBSD) analysis. The dynamic recrystallization (DRX) mechanism during hot extrusion was discussed. Then, the effect of microstructure and texture on the mechanical properties of the as-extruded alloy specimens at room temperature was discussed. The ascast ZWK510 alloy consists of α-Mg and quasicrystalline I-phase. During hot extrusion at 350℃, the main DRX mechanism is the continuous DRX near the original grain boundaries. The I-phase can accelerate the DRX behavior near these areas by obstructing the slip of dislocations. The deformation twins and massive blocky substructures formed in original grains can coordinate the DRX process near the original grain boundaries, however the DRX seldom occurs inside of these area. After further deformation, these deformation twins and massive blocky substructures are elongated along the material flow and become so-called unDRXed area, then a bimodal "necklace structure" composed of fine DRXed grains of about 2.1 μm and unrecrystallized coarse area is formed. The extruded ZWK510 alloy shows a DRX ratio of about 58% and a typical basal fiber texture of (0001)(1010)_(matrix)//extrusion direction (ED). In the DRXed area around the crushed eutectic I-phase a large number of fine I-phase precipitates are observed pinning at the newly formed DRXed grain boundaries. The 0.2% proof strength and the ultimate tensile strength of the extruded ZWK510 alloy specimen are 317 and 363 MPa, respectively, with an elongation to failure of 12%, which have been attributed to strong basal fiber texture, refined grain size as well as the existence of fine precipitates formed during the hot extrusion.
机译：在这项研究中，首先，铸态的Mg-5.0 Zn-0.9 Y-0.16 Zr（wt。％）合金（命名为ZWK510）在350℃和3.33 mms〜（-）的冲压速度下的动态显微组织变化。 1）通过电子背散射衍射（EBSD）分析进行了系统研究。讨论了热挤压过程中的动态重结晶（DRX）机理。然后，讨论了组织和织构对室温下挤压合金试样力学性能的影响。 ZWK510铸态合金由α-Mg和准晶I相组成。在350℃热挤压过程中，主要的DRX机理是在原始晶界附近的连续DRX。 I相可通过阻止位错滑移来加速这些区域附近的DRX行为。在原始晶粒中形成的形变孪晶和块状块状亚结构可以协调原始晶粒边界附近的DRX过程，但是DRX很少出现在这些区域内部。进一步变形后，这些变形孪晶和块状块状亚结构沿着物料流拉长，成为所谓的未DRXed区域，然后形成了由约2.1μm细DRX晶粒和未重结晶粗化区域组成的双峰“项链结构”。挤出的ZWK510合金的DRX比率约为58％，典型的基础纤维织构为（0001）（1010）_（基质）//挤出方向（ED）。在破碎的共晶I相周围的DRXd区域，观察到大量细微的I相沉淀物钉扎在新形成的DRXed晶界处。挤出的ZWK510合金试样的0.2％屈服强度和极限抗拉强度分别为317和363 MPa，断裂伸长率为12％，这归因于强大的基础纤维织构，细化的晶粒尺寸以及较高的抗拉强度。在热挤压过程中会形成细小的沉淀。

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  • 来源
    《Materials Science and Engineering》 |2011年第12期|p.4055-4067|共13页
  • 作者

    S.W.Xu; M.Y.Zheng; S. Kamado; K. Wu; G.J. Wang; X.Y. Lv;

  • 作者单位

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China ,Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, fapan;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, fapan;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    Northeast Light Alloy Company Limited, Harbin 150060, PR China;

    Northeast Light Alloy Company Limited, Harbin 150060, PR China;

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  • 正文语种 eng
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  • 关键词

    mg-zn-y-zr alloy quasicrystalline phase hot extrusion continuous dynamic recrystallization twin mechanical properties;

    机译：mg-zn-y-zr合金准晶相热挤压连续动态再结晶双重力学性能;

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