| Influence of powder characteristics on structure and properties of Ni3Al fabricated by spark plasma sintering |
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| 作者姓名： | 孟杰 贾成厂 何箐 |
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| 作者单位： | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| 摘 要： | Three kinds of Ni and Al powder mixtures with nominal composition Ni75Al25 were employed to prepare Ni3Al alloys by spark plasma sintering（SPS） process. The raw powders include fine powder, coarse powder and mechanically-alloyed fine powder. The effects of powder characteristics and mechanical alloying on structure and properties of sintered body were investigated by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, bending test and Vickers hardness measurements. For all mixture powders near fully dense Ni3Al alloys （relative density〉99.5%） are obtained after sintering at 1150℃ for 5 min under 40 MPa. However a small fraction of Ni can be reserved for alloy from coarse powders. The results reveal that grain size is correlated with particle character of raw powder. Ni3Al alloy made from mechanically-alloyed fine powder has finer and more homogenous microstructure. The hardness of all alloys is similar varying from HV470 to 490. Ni3Al alloy made from mechanically-alloyed fine powder exhibites higher bending strength （1 070 MPa） than others.
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| 关 键 词： | 粉末性质 火花等离子体烧结 Ni3Al 机械合金化 结构 性能 |
| 收稿时间： | 2006-04-20 |
| 修稿时间： | 2006-06-30 |
Influence of powder characteristics on structure and properties of Ni3Al fabricated by spark plasma sintering |
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| MENG Jie, JIA Cheng-chang, HE Qing.Influence of powder characteristics on structure and properties of Ni3Al fabricated by spark plasma sintering[J].Transactions of Nonferrous Metals Society of China,2006,16(A02):112-116. |
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| Authors: | MENG Jie JIA Cheng-chang HE Qing |
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| Abstract: | |
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| Keywords: | Ni3Al powder spark plasma sintering mechanical alloying |
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