中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 28 No. 12 December 2018 |
（1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;
2. Department of Civil Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China;
3. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China）
Abstract:A modified mixed strengthening model was proposed for describing the yield strength of particle reinforced aluminum matrix composites. The strengthening mechanisms of the composites were analyzed based on the microstructures and compression mechanical properties. The distribution uniformity of reinforcements and cooperation relationship among dislocation mechanisms were considered in the modified mixed strengthening model by introducing a distribution uniformity factor u and a cooperation coefficient fc, respectively. The results show that the modified mixed strengthening model can accurately describe the yield strengths of Al3Ti/2024 Al composites with a relative deviation less than 1.2%, which is much more accurate than other strengthening models. The modified mixed model can also be used to predict the yield strength of Al3Ti/2024 Al composites with different fractions of reinforcements.
Key words: metal matrix composite; strengthening model; yield strength; reinforcement; distribution uniformity
