张方哲
,
周清
,
童国权
,
陈明和
,
陶克梅
稀有金属材料与工程
采用拉伸速率突变法,研究Ti-29Nb-13Ta-5Zr(Ti-29-13)合金冷轧后在700～800℃和5×10<'-4>～1×10<'-2>s<'-1>应变速率范围内的高温变形行为和变形机制,并与典型β钛合金Ti-15V-3Cr-3Sn-3AI(Ti-15-3)进行比较.结果显示两种合金中均出现了非连续屈服现象,Ti-29-13合金的亚晶行为不同于Ti-15-3合金.Ti-29-13合金的延伸率低于Ti-15-3合金,应力指数,n几乎恒定为3.3,变形激活能为152～161 kJ/mol;Ti-15-3合金在730℃以上的n值为2.3～2.5,变形激活能为173～176kJ/mol.
关键词:
Ti-29Nb-13Ta-5Zr合金
,
超塑性
,
高温变形机制
,
微观结构
Kaiwen HUAI
材料科学技术（英）
The microstructure and mechanical behaviors of NiAl-28Cr-5Mo-1Nb eutectic alloy were investigated by using scanning electron microscopy, X-ray diffraction, transmission electron microscopy and compression tests, respectively. The alloy is mainly composed of three phases, which are the gray lamellar Cr(Mo) plate, black NiAl matrix and semicontinuously distributed Cr2Nb-type Laves phase. Through Nb addition, NiAl-Cr(Mo)/Nb alloy exhibits a reasonable balance of high temperature strength and room temperature compression ductility and its mechanical behaviors are superior to the NiAl-28Cr-6Mo eutectic alloy at all temperature. The elevated temperature compression deformation behavior of NiAl-Cr(Mo)/Nb alloy can be properly described by power-law equation.
关键词:
NiAl-28Cr-5Mo-1Nb
,
高温变形机制
,
微观组织
