龙文元,贾红梅

• 1:南昌航空大学航空制造工程学院

摘要(Abstract)：

以Nb、Si、Al和Ti粉末为原料,采用放电等离子烧结法(SPS)原位合成了Nb-20Si-5Al-xTi(x=0、18、20、22 at%)合金。利用扫描电镜(SEM)、电子探针微区分析(EPMA)和X射线衍射(XRD)等手段对合金的组织结构进行了分析,研究了Ti对Nb-20Si-5Al合金的组织的影响规律。结果表明:Ti元素的加入会明显改变合金的组织,随着Ti加入量的增加,合金的相组成由Nb_(SS)、Nb_5Si_3和Al_3Nb相转变成为Nb_(SS)、(Nb,Ti)_5Si_3和Ti相;Ti元素的加入消除了合金中的Al_3Nb相,促进了Al元素的均匀分布,同时使得合金中Nb_(SS)相的点阵常数有所增大,衍射峰向左偏转。

关键词(KeyWords)： 放电等离子烧结;Nb-Si系超高温合金;微观组织;点阵常数

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51271091);; 江西省自然科学基金(20161BAB206107)

作者(Author): 龙文元,贾红梅

DOI: 10.13289/j.issn.1009-6264.2018-0388

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