Ti对Nb-20Si-5Al超高温合金组织的影响  

Effect of Ti addition on microstructure of Nb-20Si-5Al ultrahigh temperature alloy

作　　者：龙文元[1] 贾红梅 LONG Wen-yuan;JIA Hong-mei(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《材料热处理学报》2019年第2期90-96,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51271091);江西省自然科学基金(20161BAB206107)

摘　　要：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。Nb-20 Si-5 Al-xTi(x=0,18,20,22 at%)alloys were prepared by spark plasma sintering(SPS)technology using Nb,Si,Al and Ti powders as raw materials,and microstructure of the alloys was analyzed by means of scanning electron microscopy(SEM),X-ray diffraction(XRD)and electron probe microanalysis(EPMA).The effect of Ti addition on the microstructure of the alloys was studied.The results show that the addition of Ti element can obviously change the microstructure of the alloys.With the increase of the content of Ti,the phase composition of the alloys changes from NbSS,Nb5Si3 and Al3Nb to NbSS,(Nb,Ti)5Si3 and Ti.The addition of Ti element eliminates the Al3Nb phase in the alloy,promotes the uniform distribution of the Al element,increases the lattice constant of the NbSS phase,and shifts the diffraction peak to the left.

关 键 词：放电等离子烧结 Nb-Si系超高温合金 微观组织 点阵常数 

分 类 号：TG146.4[一般工业技术—材料科学与工程]