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| HIGH VELOCITY COMPACTION BEHAVIOR AND SINTERED PROPERTIES OF Ti POWDERS WITH DIFFERENT PARTICLE SIZES |
| YAN Zhiqiao1, 2), CHEN Feng1), CAI Yixiang1) |
1) Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650
2) State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 |
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Cite this article:
YAN Zhiqiao CHEN Feng CAI Yixiang. HIGH VELOCITY COMPACTION BEHAVIOR AND SINTERED PROPERTIES OF Ti POWDERS WITH DIFFERENT PARTICLE SIZES. Acta Metall Sin, 2012, 48(3): 379-384.
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Abstract The Ti powder forming is more difficult through traditional pressing methods due to inductile and high hardening rate of Ti. Some advanced forming methods, although, are effective for increasing the green density, such as hot--pressing and isothermal--statistic pressing, they are too expensive. In our previous research, it has been demonstrated that compacting high green density of Ti powders would be achieved by high velocity compaction (HVC) which seems to be an attractive candidate that has an excellent balance between performance and cost in forming Ti powders. In this paper, the four Ti powders with average particle size of 150, 75, 48 and 38 μm, namely A, B, C, and D powder, were separately pressed by HVC technology. The influences of particle size on the green density, the maximum impact force and withdraw force in compacting were investigated. The compactability features of the four powders in HVC and the properties of sintered samples were studied. The results show that the green density of compacts obtained by HVC method is related with both particle size and apparent density. At relatively small impact energy, the green density of compacts is mainly determined by the apparent density of powders. While at larger impact energy, it is mainly determined by the particle size. For powders pressed at impact energy lower than 761 J, the highest green density is obtained for compacts made of B powders which has maximum apparent density. With higher impact energy, the highest green density is obtained for compacts made of A powder which has maximum particle size. It is found that the influence of particle size on the maximum impact force is similar to those on the green density, and for the four powders the relationships between the maximum impact force and the green density all comply with Huang Pei-yun equation. Particle size shows no observable influence on withdraw force. The sintered density increases with decreasing particle size of powders, accompanying with grain growth of different degrees. After vacuum sintering at 1250 ℃, nearly fully dense samples can be prepared for the compacts of four powders.
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Received: 28 September 2011
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| Fund: Supported by National Natural Science Foundation of China (No.51004040) and Open Research Fund of State Key Laboratory of Powder Metallurgy (No.20110952K) |
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