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<p>The differences in mechanical properties at different temperatures and microstructure between extruded-aged Mg-11Al-1Ag (abbreviated as A11-Q alloy) and extruded-aged Mg-8Sn-2Al-1.5Bi-1Ag alloys (abbreviated as TA82-BQ alloy) were systematically investigated. The extruded-aged A11-Q alloy obtains high UTS (385.2&#xa0;MPa) and EL (9.4%), which are higher than the UTS (358.9&#xa0;MPa) and EL (7.1%) of extruded-aged TA82-BQ alloy at room temperature. However, the UTS (160.2&#xa0;MPa) of extruded-aged TA82-BQ alloy is higher than that (140.1&#xa0;MPa) of extruded-aged A11-Q alloy at 160&#xa0;°C, which is closely related to their microstructure. The microstructure of extruded-aged A11-Q alloy is composed of <i>α</i>-Mg and Mg<sub>17</sub>Al<sub>12</sub> precipitates. And <i>α</i>-Mg, Mg<sub>2</sub>Sn precipitates and few Mg<sub>17</sub>Al<sub>12</sub> precipitates are observed in extruded-aged TA82-BQ alloy. The extruded-aged A11-Q alloy obtains a smaller average grain size with a weaker grain texture and fewer deformed grains. Furthermore, a number of rodlike and ellipsoidal precipitates form in both extruded-aged A11-Q and TA82-BQ alloys, which plays a role on precipitation strengthening. The Mg<sub>2</sub>Sn precipitates and corresponding elements distributions result in a higher tensile strength at elevated temperature and Mg<sub>17</sub>Al<sub>12</sub> precipitates mainly contribute to a higher tensile strength at room temperature.</p>

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Competition of Mechanical Properties Between Mg-Al and Mg-Sn Alloys at Different Temperatures and Corresponding Microstructure Characterization

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Li Wandong,
  • Yang Hongmei,
  • Luo Xinyu,
  • Lou Zongyong

摘要

The differences in mechanical properties at different temperatures and microstructure between extruded-aged Mg-11Al-1Ag (abbreviated as A11-Q alloy) and extruded-aged Mg-8Sn-2Al-1.5Bi-1Ag alloys (abbreviated as TA82-BQ alloy) were systematically investigated. The extruded-aged A11-Q alloy obtains high UTS (385.2 MPa) and EL (9.4%), which are higher than the UTS (358.9 MPa) and EL (7.1%) of extruded-aged TA82-BQ alloy at room temperature. However, the UTS (160.2 MPa) of extruded-aged TA82-BQ alloy is higher than that (140.1 MPa) of extruded-aged A11-Q alloy at 160 °C, which is closely related to their microstructure. The microstructure of extruded-aged A11-Q alloy is composed of α-Mg and Mg17Al12 precipitates. And α-Mg, Mg2Sn precipitates and few Mg17Al12 precipitates are observed in extruded-aged TA82-BQ alloy. The extruded-aged A11-Q alloy obtains a smaller average grain size with a weaker grain texture and fewer deformed grains. Furthermore, a number of rodlike and ellipsoidal precipitates form in both extruded-aged A11-Q and TA82-BQ alloys, which plays a role on precipitation strengthening. The Mg2Sn precipitates and corresponding elements distributions result in a higher tensile strength at elevated temperature and Mg17Al12 precipitates mainly contribute to a higher tensile strength at room temperature.