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| High-temperature mechanical properties of in-situ nano-Al2O3 reinforced aluminum matrix composites prepared by powder hot extrusion |
| KUANG Shuqian1,2, ZHANG Liangxian1,2, ZHANG Tao1,2, JIANG Tengjiao1,2, ZHAO Ke3, LIU Jinling1,2 |
1. School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 611756, China;
2. Sichuan Province Key Laboratory of Advanced Structural Materials Mechanical Behavior and Service Safety, Southwest Jiaotong University, Chengdu 611756, China;
3. School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China |
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Abstract The weight reduction design of supersonic aircraft urgently requires lightweight and high-strength Al matrix materials for service above 300 ℃. In this study, an in-situ nano-Al2O3 reinforced Al matrix composites were fabricated via powder hot extrusion, and their microstructure and high-temperature mechanical properties were investigated by X-ray diffractometer, field emission scanning electron microscope, transmission electron microscope, and tensile property test. The results show that in-situ generated nano-Al2O3 particles (approximately 115 nm) are uniformly dispersed within the Al matrix, which exhibits an average grain size of approximately 640 nm, and yielding a composite hardness (HV) of 148. After thermal exposure at 500 ℃ for 100 h, the composites maintain nearly unchanged hardness and average grain size. The composites achieves a room-temperature tensile strength of 482 MPa with an elongation of 5.9%, while maintaining a tensile strength of 240 MPa at 300 ℃. This enhancement is primarily attributed to the effective pinning of grain boundaries and hindrance of dislocation motion by the in-situ nanoparticles, maintaining the thermal stability of the structure, which significantly improves the high-temperature mechanical performance of the composites.
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Received: 11 April 2025
Published: 13 October 2025
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2025, Vol. 30 
