摘要
采用机械活化技术与放电等离子烧结工艺相结合，原位烧结制备出优质TiAl／Al2O3块状纳米材料，该技术极大地提高了制备纳米合金的效率。研究结果表明：机械活化20h后得到晶粒度小于25nm的纳米粉体，放电等离子烧结得到密度为3．73g／cm^3的γ＋α2双相组织，组成相的晶粒度小于130nm，硬度可达HV550，且分布均匀，具有优良的高温抗氧化性能，氧化速率常数比常规烧结方法优越1～2个数量级。
Using the method of mechanical activation ano spark plasma sintering,a high quality TiAl/Al2O3 bulk nano-material was fabricated in situ. This technology enhances the fabrication efficiency of nano-alloy. The research results show that, the crystal sizes of nano-powder are less than 25nm after 20 hours mechanical activation. Through spark plasma sintering in situ, the final nano- material has dual-phase γ＋α2, and its density is 3.73g/cm^3. The crystal sizes of dual-phase are less than 130nm and the hardness of nano-alloy can reach to HV550 and uniformly distribute. The nano-alloy has good high-temperature anti-oxidation capability. The oxidation parabolic constants is better than that from traditional method by 1～2 order of magnitude.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2006年第13期1425-1428,共4页
China Mechanical Engineering
基金
湖北省"十五"重点攻关项目(2001AA101B02)
