| Synthesis and properties of bulk nanocrystalline Mg2Si through ball-milling and reactive hot-pressing |
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| 作者单位： | Key Laboratory of Materials Physics Institute of Solid State Physics，Chinese Academy of Sciences，Key Laboratory of Materials Physics，Institute of Solid State Physics，Chinese Academy of Sciences，Key Laboratory of Materials Physics，Institute of Solid State Physics，Chinese Academy of Sciences，Key Laboratory of Materials Physics，Institute of Solid State Physics，Chinese Academy of Sciences，Hefei 2300 31，China，Hefei 2300 31，China，Hefei 2300 31，China，Hefei 2300 31，China |
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| 摘 要： | 1 Introduction The intermetallic compound Mg2Si is useful as strengthening phase in the metal matrix composites (MMC) due to its low density (1.99 g/cm3) and high strength-to-mass ratio[1?5]. It is also promising as a basic material for thermoelectric ene…
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| 关 键 词： | Mg2Si 纳米晶体 球磨 热压 机械性能 |
| 收稿时间： | 2005-09-09 |
| 修稿时间： | 2006-06-20 |
Synthesis and properties of bulk nanocrystalline Mg2Si through ball-milling and reactive hot-pressing |
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| XIONG Wei,QIN Xiao-ying,KONG Ming-guang,CHEN Li. Synthesis and properties of bulk nanocrystalline Mg2Si through ball-milling and reactive hot-pressing[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(5): 987-991. DOI: 10.1016/S1003-6326(06)60365-8 |
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| Authors: | XIONG Wei QIN Xiao-ying KONG Ming-guang CHEN Li |
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| Affiliation: | 1. Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA;2. Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA;3. National Key Laboratory for Precision Hot Processing of Metals and School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;1. Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea;2. Advanced Materials Research Team, Central Advanced Research and Engineering Institute, Hyundai Motor Company, Uiwang 16082, South Korea;3. Department of Nano Applied Engineering, Kangwon National University, Chuncheon 24341, South Korea |
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| Abstract: | Bulk nanocrystalline Mg2Si(n-Mg2Si) was prepared by mechanical milling and reactive hot-pressing in vacuum and its mechanical properties were characterized. The results indicate that the grain sizes of Mg and Si decrease non-monotonously with increasing ball-to-powder mass ratio(BPR). The content of Mg2Si phase increases with increasing milling time; however, pure Mg2Si phase cannot be obtained by direct ball milling. Moreover, monolithic is Mg2Si phase can only be obtained when as much as 10% of excess Mg was blended in the raw mixtures. The relative density (D) and fracture toughness as well as hardness of bulk Mg2Si samples can be raised effectively by increasing the pressure in hot-pressing. After hot-pressing at 400 °C for 60 min under 1.5 GPa, highly dense(D>98%) n-Mg2Si (d=60 nm) was obtained, whose fracture toughness (KIC≈1.46 MPa·m1/2) and Vickers hardness(HV≈4.38 Gpa) are superior to those of conventional coarse-grained Mg2Si. |
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| Keywords: | Mg2Si nanocrystalline ball-milling hot-pressing mechanical properties |
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