低温退火时间对Laves相Cr_2Nb固相热反应合成的影响

Effects of annealing times at low temperature on Laves phase Cr_2Nb synthesized by thermal solid phase reaction

研究了900℃退火时,退火时间对Cr-Nb机械合金化(MA)粉的Laves相Cr2Nb固相热反应合成的影响规律,获悉了15h MA粉在900℃低温退火时能使Cr2Nb固相热反应合成充分进行的最短时间。优化出的Cr2Nb固相热反应合成低温退火时间,为通过MA+热压(或烧结)工艺路线制备出具有微/纳米晶结构的高强高韧Cr2Nb合金或Cr2Nb基复合材料提供了可能性。

Effects of annealing times at 900℃ for Cr- Nb mechanical alloying（MA） powders on Laves phase CrzNb synthesized by thermal solid phase reaction have been investigated. The shortest annealing times at 900℃ for 15h MA powders for fully synthesizing of Laves phase CrzNb are obtained. The optimized low temperature annealing time for Laves phase CrzNb synthesized by thermal solid phase reaction provide possibility for preparing both high strength and toughness CrzNb alloy or CrzNb - based composite with micro -/nano- grains by a process of mechanical alloying followed by a hot pressing or sintering.