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对Cr-33.3%Ta(原子分数)混合粉末进行高能球磨,采用X射线衍射仪分析了机械合金化对Laves相TaCr_2固相合成反应的影响。结果表明,机械合金化过程对TaCr_2的固相合成反应产生显著活化效果,Cr-33.3%Ta混合粉球磨30 h后,再高温固相合成3 h时,使Laves相TaCr_2固相合成反应充分进行的温度门槛值为1 000℃,而未机械活化的原始样品的合成温度门槛值为1 350℃;在1 000℃×3 h高温合成时,使Laves相TaCr_2合成反应充分进行的机械合金化时间为25 h;球磨30 h的Cr-33.3%Ta混合粉在1 000℃合成时,固相合成反应充分进行的最短时间为1 h;为了避免或减少机械合金化粉末在发生Laves相TaCr_2固相合成反应之前发生非平衡过饱和固溶体的脱溶,应尽量采用到温进炉的方式。
High-energy ball milling of Cr-33.3% Ta (atomic fraction) mixed powders was carried out. The effect of mechanical alloying on the solid-phase reaction of Laves phase TaCr_2 was analyzed by X-ray diffractometer. The results show that the mechanical alloying process has a significant activation effect on the solid-phase reaction of TaCr_2. When the Cr-33.3% Ta mixed powder is ball-milled for 30 h, The threshold temperature of synthesizing the original sample without mechanical activation is 1 350 ℃. The mechanical alloying time of Laves phase TaCr 2 synthesis reaction at the high temperature synthesis of 1 000 ℃ × 3 h Was 25 h. The shortest time for the solid-phase synthesis reaction to fully proceed at 1 000 ℃ when the Cr-33.3% Ta mixed powder was ball milled for 30 h was 1 h. In order to avoid or reduce the formation of Laves phase TaCr 2 solid phase Unbalanced supersaturated solid solution before the synthesis reaction took place, should try to use warm into the furnace.