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<p>Magnesium alloys ZM6 and EV31A have been widely used in aerospace, transportation field. However, the porosity defects are inevitably in magnesium alloy components which are usually manufactured by casting. In this study, the effects of shrinkage porosity defects on the mechanical properties of magnesium alloys ZM6 and EV31A are investigated in details. A dedicated casting method was developed to controlled shrinkage porosity produced in casting. The porosity defects in casting samples were detected by X-ray non-destructive testing and then graded and screened to grade 2–4 according to the ASTM E155. The samples were machined to standard mechanical specimen for subsequent mechanical testing. The tensile and fatigue testing were conducted to study the effects of shrinkage porosity defects on the mechanical properties. And the scanning electron microscopy (SEM) was utilized to characterize the fracture morphology. The tensile testing indicated that the yield strength, tensile strength, elongation after fracture, and reduction of area were significantly degraded by shrinkage porosity in both ZM6 and EV31A. The ultimate strength of magnesium alloy ZM6 and EV31A decreases from 254.34 MPa and 303.67 MPa to 175.20 MPa and 207.40 MPa at the grade 4, with the maximum decrease ratios reaching 31.12% and 31.70%, respectively. Fatigue testing revealed that the fatigue limits of both alloys were considerably reduced by porosity defects. The fatigue limits of magnesium alloys ZM6 and EV31A decrease from 68.70 MPa and 70.70 MPa to 42.25 MPa and 47.75 MPa at the grade 4, with the maximum decrease ratios reaching 38.50% and 32.46%, respectively. On the other hand, the fatigue limit was decreased nearly linear as the defect level increased in EV31A, while the fatigue limit of ZM6 exhibits limited sensitivity to increasing defect level from grade 2–4 . These findings provide systematic insight into the effects of defects on mechanical properties of magnesium alloys ZM6 and EV31A and offer a basis for quality assessment and performance prediction in engineering applications.</p>

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Experimental Study of the Effect of Shrinkage Porosity Defects on the Mechanical Properties of Magnesium Alloys ZM6 and EV31A

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Xing Liu,
  • Rupeng Zhu,
  • Fei Su,
  • Jian Li,
  • De Ni,
  • Xin Tang

摘要

Magnesium alloys ZM6 and EV31A have been widely used in aerospace, transportation field. However, the porosity defects are inevitably in magnesium alloy components which are usually manufactured by casting. In this study, the effects of shrinkage porosity defects on the mechanical properties of magnesium alloys ZM6 and EV31A are investigated in details. A dedicated casting method was developed to controlled shrinkage porosity produced in casting. The porosity defects in casting samples were detected by X-ray non-destructive testing and then graded and screened to grade 2–4 according to the ASTM E155. The samples were machined to standard mechanical specimen for subsequent mechanical testing. The tensile and fatigue testing were conducted to study the effects of shrinkage porosity defects on the mechanical properties. And the scanning electron microscopy (SEM) was utilized to characterize the fracture morphology. The tensile testing indicated that the yield strength, tensile strength, elongation after fracture, and reduction of area were significantly degraded by shrinkage porosity in both ZM6 and EV31A. The ultimate strength of magnesium alloy ZM6 and EV31A decreases from 254.34 MPa and 303.67 MPa to 175.20 MPa and 207.40 MPa at the grade 4, with the maximum decrease ratios reaching 31.12% and 31.70%, respectively. Fatigue testing revealed that the fatigue limits of both alloys were considerably reduced by porosity defects. The fatigue limits of magnesium alloys ZM6 and EV31A decrease from 68.70 MPa and 70.70 MPa to 42.25 MPa and 47.75 MPa at the grade 4, with the maximum decrease ratios reaching 38.50% and 32.46%, respectively. On the other hand, the fatigue limit was decreased nearly linear as the defect level increased in EV31A, while the fatigue limit of ZM6 exhibits limited sensitivity to increasing defect level from grade 2–4 . These findings provide systematic insight into the effects of defects on mechanical properties of magnesium alloys ZM6 and EV31A and offer a basis for quality assessment and performance prediction in engineering applications.