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| Effect of Heat Treatment on Microstructure and Mechanical
Properties of In-Situ Al Matrix Composite for Storage Tanks |
| WANG Lei1， CHEN Zhe1，2， WANG Haowei1，2 |
| 1. School of Materials Science and Engineering， Institute of special materials， Shanghai Jiao Tong University，
Shanghai 200240， China； 2. State Key Laboratory of Metal Matrix Composites，
Shanghai Jiao Tong University， Shanghai 200240， China |
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Abstract To meet the lightweight requirements of the new generation of aerospace, obtaining the optimal heat
treatment process parameter combination of in-situ TiB2/2219 composite for storage tanks to improve its comprehensive
mechanical properties further has become an urgent problem. In this study, the effect of solution and ageing process on
tensile properties of in-situ TiB2/2219 composite was systematically studied through advanced characterization
techniques and analysis of tensile test data at room temperature was conducted. The results show that the compositehas
the highest hardness of 108 HV at 535 ℃, 1.5 h solution. Pre-stretch can increase the dislocation density, provide more
nucleation sites for θ' phase, improve the nucleation rate, and increase the volume fraction of the precipitated phase
during ageing. To promote the formation of atomic clusters, increase the nucleation site of the precipitated phase, and
further improve the nucleation efficiency of θ' phase, a two-stage ageing system was designed. After ageing at 100 ℃×
8 h and 160 ℃ ×13 h, the yield strength and tensile strength of the composite increased by 40.5% and 12.5%,
respectively, while the fracture strain remained 8.0%. The results have accumulated effective experimental data and
thus support the engineering application of in-situ aluminum matrix composites for space storage tanks.
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Received: 29 July 2024
Published: 16 January 2025
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2024, Vol. 7 
