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<p>In this study, ultra-high strength VW94 magnesium alloy was prepared by induction melting and then hot extrusion. The result shows that: The as-cast VW94 alloy is mainly composed of α-Mg, long-period stacking ordered (LPSO) phases and β phases. During the hot extrusion process, dynamic recrystallization occurs and the microstructure of extruded VW94 alloys is composed of DRXed regions, Un-DRXed regions, β phases and LPSO phases. With the increase in extrusion ratio, recrystallized grains become finer and the dislocation density becomes higher. The texture of DRXed grains is more random, and the texture of Un-DRXed grains is a typical extruded fiber texture. The VW94 magnesium alloy with an extrusion ratio of 36 owns the best mechanical properties with ultimate tensile strength of 542&#xa0;MPa, yield strength of 448&#xa0;MPa, elongation of 7.0%, the microhardness of 136&#xa0;HV. The strength improvement of as-extruded VW94 alloy is mainly attributed to fine grain strengthening, second phase strengthening, and dislocation strengthening.</p>

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Microstructure and Mechanical Properties of Ultra-High Strength VW94 Magnesium Alloy with Different Extrusion Ratios

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Weixiang Sun,
  • Xiaowei Feng,
  • Xiaopei Li,
  • Bo Feng,
  • Kaihong Zheng,
  • Xianhua Chen

摘要

In this study, ultra-high strength VW94 magnesium alloy was prepared by induction melting and then hot extrusion. The result shows that: The as-cast VW94 alloy is mainly composed of α-Mg, long-period stacking ordered (LPSO) phases and β phases. During the hot extrusion process, dynamic recrystallization occurs and the microstructure of extruded VW94 alloys is composed of DRXed regions, Un-DRXed regions, β phases and LPSO phases. With the increase in extrusion ratio, recrystallized grains become finer and the dislocation density becomes higher. The texture of DRXed grains is more random, and the texture of Un-DRXed grains is a typical extruded fiber texture. The VW94 magnesium alloy with an extrusion ratio of 36 owns the best mechanical properties with ultimate tensile strength of 542 MPa, yield strength of 448 MPa, elongation of 7.0%, the microhardness of 136 HV. The strength improvement of as-extruded VW94 alloy is mainly attributed to fine grain strengthening, second phase strengthening, and dislocation strengthening.