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<p>The current study investigates the impact of cryo-rolling on the microstructural evolution and mechanical performance of AM50 cast magnesium alloy to overcome the inherent limitations in ductility and formability posed by its hexagonal close-packed (HCP) crystal structure. The as-cast AM50 alloy was solution-treated and subjected to multi-pass cryo-rolling at − 196&#xa0;°C, achieving a total thickness reduction of 70%. Using optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD), a thorough microstructural analysis showed a notable refinement of the grain from 95 ± 42&#xa0;µm in the base alloy to 11 ± 5.4&#xa0;µm in the cryo-rolled condition. While XRD results confirmed increased phase intensity and uniformity of β-Mg<sub>17</sub>Al<sub>12</sub> and Al<sub>8</sub>Mn<sub>5</sub> intermetallics, SEM analysis demonstrated the transformation of coarse, sparsely distributed β-Mg<sub>17</sub>Al<sub>12</sub> precipitates into fine, uniformly dispersed particles with a reduced precipitation-free area. The mechanical properties significantly improved as a result of these microstructural improvements. Microhardness rose from 94 ± 13 to 109 ± 21 VHN, and tensile testing showed that elongation increased from 11 ± 2.2 to 21 ± 3.5%, yield strength (YS) increased from 118 ± 17 to 152 ± 21&#xa0;MPa, and ultimate tensile strength (UTS) increased from 191 ± 14 to 229 ± 24&#xa0;MPa. Fractography revealed a transition from coarse to fine dimple morphology, confirming enhanced ductility and toughness.</p>

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Structure–Property Relationship in Cryo-Rolled AM50 Magnesium Alloy: From Grain Refinement to Ductility Gain

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • K. Arunkumar,
  • Gogulamudi Balakrishna,
  • Bh Lakshmipathi Raju,
  • P. Prakash,
  • Yadluri Ravi Kishore,
  • Bade Venkata Suresh,
  • M. Anil Kumar

摘要

The current study investigates the impact of cryo-rolling on the microstructural evolution and mechanical performance of AM50 cast magnesium alloy to overcome the inherent limitations in ductility and formability posed by its hexagonal close-packed (HCP) crystal structure. The as-cast AM50 alloy was solution-treated and subjected to multi-pass cryo-rolling at − 196 °C, achieving a total thickness reduction of 70%. Using optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD), a thorough microstructural analysis showed a notable refinement of the grain from 95 ± 42 µm in the base alloy to 11 ± 5.4 µm in the cryo-rolled condition. While XRD results confirmed increased phase intensity and uniformity of β-Mg17Al12 and Al8Mn5 intermetallics, SEM analysis demonstrated the transformation of coarse, sparsely distributed β-Mg17Al12 precipitates into fine, uniformly dispersed particles with a reduced precipitation-free area. The mechanical properties significantly improved as a result of these microstructural improvements. Microhardness rose from 94 ± 13 to 109 ± 21 VHN, and tensile testing showed that elongation increased from 11 ± 2.2 to 21 ± 3.5%, yield strength (YS) increased from 118 ± 17 to 152 ± 21 MPa, and ultimate tensile strength (UTS) increased from 191 ± 14 to 229 ± 24 MPa. Fractography revealed a transition from coarse to fine dimple morphology, confirming enhanced ductility and toughness.