摘要
研究了强磁场对NiAl-Cr(Mo)-0.2Hf共晶合金微观组织和力学性能的影响.结果表明:强磁场处理后合金共晶胞内的Cr(Mo)层片发生碎化,共晶胞间的Cr(Mo)相呈现粗化的趋势,且合金中Cr(Mo)的化学成分发生了很大变化.分析为强磁场促进了合金中相间和胞界处的原子扩散、迁移,从而导致了合金组织形貌及成分的变化.强磁场处理后合金的室温压缩应变可达34%,比普通热处理提高近1倍;断裂韧性也得到一定程度的提高.
Magnetic field treatment can alter obviously the microstructure of the NiAl-Cr（Mo）- 0.2Hf alloy, Cr（Mo） plates in eutectic cell were broken and massive Cr（Mo） phases in intercellular zone coarsened. The detection of composition of constituent phases shows that the high magnetic field treatment changed the composition of Cr（Mo） phases. The above changes can be attributed to the acceleration of atomic diffusions between phases and at cell boundaries under magnetic field. The magnetic field treatment makes the compressive strain increase to 34%, almost two times of the heat treated sample, and makes the fracture toughness also improve.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第5期524-528,共5页
Acta Metallurgica Sinica
