B、Y及冷却速度对Ti-47Al-2Cr-2Nb合金组织的细化作用
B、Y급냉각속도대Ti-47Al-2Cr-2Nb합금조직적세화작용
Effects of minor B,Y and Cooling Rate on the Microstructure Refinement of Ti-47Al-2Cr-2Nb Alloy
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