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<p>In this work, the microstructure and properties of as-cast and solution-treated AZ31B alloys alloyed with trace Zr, Ca and Sr elements were investigated, and the effects of trace Zr, Ca and Sr on the microstructure and mechanical properties of AZ31B alloy were analyzed. Multi-scale characterization methods including transmission electron microscopy (TEM) were adopted to characterize and analyze the microstructures of the alloy under as-cast and solution-treated states. The solution-treated microstructure consists of <i>α</i>-Mg matrix and a small amount of residual granular compounds. After solution treatment at 480&#xa0;°C for 4&#xa0;h, only the single <i>α</i>-Mg phase is observed in the microstructure. Room-temperature tensile property tests were carried out by using a universal mechanical testing machine. The results reveal that both the yield strength and elongation of the alloy are improved after solution treatment in comparison with the as-cast counterpart. The alloy achieves the optimal strength-ductility balance after solution treatment at 480&#xa0;°C for 4&#xa0;h, with a yield strength of 182&#xa0;MPa and an elongation of 20.3%. TEM observations show that a large number of cell structures formed by entangled dislocations exist in the microstructure. Such structures can act as dislocation sources to continuously proliferate dislocations, thereby promoting the subsequent plastic deformation of the alloy.</p>

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Investigation on the Microstructure and Properties of AZ31B Alloy with Trace Zr, Ca and Sr Addition

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Jiang Jiao,
  • Zhang Lei

摘要

In this work, the microstructure and properties of as-cast and solution-treated AZ31B alloys alloyed with trace Zr, Ca and Sr elements were investigated, and the effects of trace Zr, Ca and Sr on the microstructure and mechanical properties of AZ31B alloy were analyzed. Multi-scale characterization methods including transmission electron microscopy (TEM) were adopted to characterize and analyze the microstructures of the alloy under as-cast and solution-treated states. The solution-treated microstructure consists of α-Mg matrix and a small amount of residual granular compounds. After solution treatment at 480 °C for 4 h, only the single α-Mg phase is observed in the microstructure. Room-temperature tensile property tests were carried out by using a universal mechanical testing machine. The results reveal that both the yield strength and elongation of the alloy are improved after solution treatment in comparison with the as-cast counterpart. The alloy achieves the optimal strength-ductility balance after solution treatment at 480 °C for 4 h, with a yield strength of 182 MPa and an elongation of 20.3%. TEM observations show that a large number of cell structures formed by entangled dislocations exist in the microstructure. Such structures can act as dislocation sources to continuously proliferate dislocations, thereby promoting the subsequent plastic deformation of the alloy.