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采用电子背散射衍射(EBSD)技术研究了轧制和退火对黄铜H68样品晶界特征分布(GBCD)的影响。结果表明:再结晶处理后经小变形冷轧(6%)的黄铜H68样品,在650℃×10 min退火比在270℃×10 min退火和270℃×10 min-650℃×10 min退火生成更高比例的特殊晶界。进一步分析指出:在应力大小和分布相近的条件下,650℃退火时,晶界迁移的的驱动力大,相比270℃退火更能促使样品中原有及新形成的非共格∑3晶界广泛迁移,在迁移中彼此相遇并发生交互反应,派生出Σ9和Σ27晶界,使Σ3n(n=1,2,3)特殊晶界的比例增大,当退火10 min时,特殊晶界的比例达到峰值;随后如继续保温,在界面能作用下,晶粒合并、长大使特殊晶界比例下降。
The effect of rolling and annealing on the grain boundary characteristic distribution (GBCD) of brass H68 samples was studied by electron backscatter diffraction (EBSD) technique. The results show that annealed at 650 ℃ for 10 min and annealed at 270 ℃ × 10 min and 270 ℃ × 10 min-650 ℃ × 10 min, respectively, after recrystallization treatment. Generate a higher proportion of special grain boundaries. Further analysis shows that the driving force of the grain boundary migration at 650 ℃ is large under the condition of similar stress and size distribution. Compared with annealing at 270 ℃, the original and newly formed non-coherent Σ3 grain boundary Widely migrated, met each other during migration and interacted with each other, derived Σ9 and Σ27 grain boundaries, and increased the proportion of Σ3n (n = 1,2,3) special grain boundaries. When annealed for 10 min, the special grain boundaries The proportion reached the peak; then continue to heat, the role of the interface, the grain merger, grow a special proportion of grain boundaries decreased.