| METALS AND METAL MATRIX COMPOSITES |
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| Crystallization Behavior of the Al-based Metal Glass Powders Sprayed by Low Temperature Supersonic Velocity Under Various Heat Flow Fields |
| WANG Xiaoming1, WEN Shu2, YANG Baijun3, HAN Guofeng1, ZHU Sheng1, LI Yuzhong4
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1 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072
2 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105
3 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016
4 Yantai Demonstration Software Technology Co., Ltd.,Yantai 264000 |
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Abstract The Euler-Lagrange based numerical simulation and experimental tests were combined to achieve the three kinds of gas-solid two-phase flow fields, which referred to the Al-based metal glass powder-particles with propane-air, kerosene-oxygen and high temperature air. Meanwhile, the evolution law of the acceleration, temperature rise and crystallization of the powder induced by heat flow of gas field were expounded by the basic thermal physical property characterization of Al-based metal glass powder. It could be found from the results that various temperature fields produced by various heat flow fields were beneficial for accelerating the deposition of glass powders. The heat flow field of kerosene-oxygen would induce the sprayed particles to release harmful phases like Al2Y, and even cause melting and vaporization. The towing effect of the hot air flow could not eliminate the inherent brittleness of Al-based metal glass powders, blocking the way for the particles to form deposited layers with high plastic distortion. Fortunately, the heat flow effect of propane-air was able to adjust the Al-based metallic glass powder to the thermoplastic temperature range, and make full use of the high plasticity and low viscosity of the Al-based metal glass on its thermoplastic state, which can achieve high efficiency deposition as well as control crystallization transition. Consequently, propane-air was recognized as an ideal heat flow resource to achieve the deposition of Al-based metal glass with maximum original properties.
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Published: 16 September 2019
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| Fund:This work was financially supported by the National Key R & D Program of China (2018YFB1105800); Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University (VCAME201706); Support Project of the Military Plan Key Fund (9140A27030312JB3501). |
| About author:: Xiaoming Wang, Ph.D. degree, associate research fellow, National Key Laboratory for Remanufacturing, Army Academy of Armored Forces. The main research direction: light alloy surface protection, additive remanufacturing, composite energy field forming. He has published more than 70 journal papers and 4 monographs, applied 20 national invention patents and all of them were authorized. In addition, he acquired the award of Provincial and ministerial level scientific and technological progress first prize and two third prizes. |
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2019, Vol. 33 
