摘要
利用SPS熔铸工艺成功制备了近理论密度的Nb/Nb5Si3原位复合材料,并用XRD、扫描电镜(SEM)、电子探针微区分析(EPMA)和电子能谱分析(EDS)研究复合材料的相组成和微观结构。结果表明,SPS熔铸的Nb/Nb5Si3复合材料组织由近球状的初生Nb颗粒与(Nb+Nb5Si3)共晶组织组成,且随着冷却速度增加,复合材料组织中的初生Nb颗粒和共晶组织变得细小。SPS熔铸工艺可同步实现Nb/Nb5Si3复合材料的原位合成与液态成形一体化,所制备Nb/Nb5Si3原位复合材料的密度达到理论密度的99.69%。
Fully dense Nb/Nb5Si3 in-situ composites were successfully prepared by SPS smelting-casting, and phase constituent and microstructure of the composites were investigated by XRD (X-ray diffraction), SEM (scanning electron microscope), EPMA (electron probe micro-area analysis) and EDS(energy disperse spectroscopy). The results indicate that microstructure of the Nb/Nb5Si3 in-situ composites prepared by SPS smelting-casting is composed of near-spherical primary Nb particle and (Nb+Nb5Si3) eutectoid, and with increasing in cooling rate, near-spherical primary Nb particle and (Nb+Nb5Si3) eutectoid are refined gradually. Prepared composites reach 99.69% theoretical density in density. Integration of in-situ synthesis with liquid forming can be realized in preparation of Nb/Nb5Si3 in-situ composites by SPS smelting-casting.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第2期167-169,共3页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(50276023
50574042)
中国博士后科学基金(20080441022)
江苏省博士后科研资助计划(0802006B)
江西省教育厅科技研究计划项目(GJJ09364)
作者简介
陈哲,男,1967年出生,博士后,副教授,南京大学物理系,南京,(210093),电话:15979012960.E-mail:zhecheng3@sina.com
通讯作者:严有为.男.1965年出生,教授,华中科技大学材料科学与工程学院,武汉(430074),电话:027-87543876,E-maii:yanyw@mamhust.edu.cn