Microstructure and properties of Ni–Ni3Si composites by directional solidification.

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• Affiliation of Author(s):冶金工程学院
• Journal:Physica B: Condensed Matter
• Key Words:中文关键字：定向凝固；共晶自生复合材料；显微硬度，英文关键字：Directional solidification; Eutectic in situ compo
• Abstract:Ni- Ni3Si composites are prepared by Bridgman directional solidification technology under different growth conditions, aiming to improve the ductility of the Ni3Si compound and investigate the relationship between solidification microstructure and the properties. Microstructure of the Ni- Ni3Si hypoeutectic in situ composites transforms from regular lamellar eutectic to cellular structure then to dendritic crystal with the increase of the solidification rate. Ni- Ni3Si eutectic composites display regular lamellar eutectic structure at the solidification rate R=6.0~40.0 μm/s and the lamellar spacing is decreased with the increase of the solidification rate. Moreover, the Ni- Ni3Si hypoeutectic composites present lower micro-hardness than pure Ni3Si, which indicate Ni- Ni3Si hypoeutectic composites have the higher ductility, whereas the ductility of the Ni- Ni3Si eutectic composites scarcely has been improved. This is caused by the formation of the metastable Ni31Si12 phase in the Ni- Ni3Si eutectic composites.
• Note:（SCI: 000305792400049）（EI: 20122715198239）
• Co-author:JunZhang,KunWu,YoupingMa,LinLiu,HengzhiFu
• First Author:Cui Chunjuan
• Indexed by:Journal paper
• Volume:卷：407
• Issue:期：17
• Page Number:页：3566–3569
• Translation or Not:no
• Date of Publication:2012-09-01