不同形变量轧制黄铜H80低温退火后的晶界特征分布  

Grain boundary character distributions of brass H80 annealed at low temperature after rolling at different starin

作　　者：姜英[1] 蔡正旭[1] 王卫国[1] 郭红[2] 

机构地区：[1]山东理工大学机械工程学院,淄博255049 [2]山东理工大学分析测试中心,淄博255049

出　　处：《材料热处理学报》2010年第6期18-22,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50771060)

摘　　要：采用电子背散射衍射(EBSD)技术研究了黄铜H80经6%～50%冷轧变形后在633 K下进行长时间(24～72 h)退火后的晶界特征分布(GBCD)。结果表明:小变形(6%～10%)冷轧后较比中等变形(25%～50%)冷轧后的H80样品在随后的退火中更容易诱发高比例的∑3、∑9和∑27等特殊晶界,其总值最高达76%;而且∑3n(n=1,2,3)特殊晶粒团的尺寸较大(100μm),一般大角晶界网络连通性的阻断效果明显优于后者。通过对特殊晶界的分布、形态和数量的对比分析,指出小变形低温退火可诱发某些晶界优先迁移,在迁移中生成非共格的∑3晶界并发生这些晶界的交互反应,这可能是黄铜H80实现GBCD优化的主要微观机制。Grain boundary character distributions（GBCD） of brass H80 annealed at 633 K for long time（24 ～ 72 h） after cold rolled with strains varied from 6% to 50%（thickness reduction） were investigated by means of electron back scatter diffraction（EBSD） technique.The results show that special boundaries such as ∑3,∑9 and ∑27 are largely populated in the specimen which is cold rolled with low strain（6% ～ 10%） followed by annealing.In this specimen,the fraction of total special boundaries reached 76%,the average size of the clusters of grains bounded by ∑3n（n = 1,2,3） special boundaries is larger than 100 μm and the connectivity of general high angle boundaries（HABs） networks is interrupted sufficiently by the special boundaries.Such results implys the GBCD is optimized with satisfaction.Further analysis shows that the strain induced boundary migration（SIBM） occurs during annealing after cold rolling with low strains,the migration and interaction of incoherent ∑3 grain boundary may be the root of GBCD optimization.

关 键 词：黄铜H80 回复 再结晶 特殊晶界分布 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG111.7[金属学及工艺—金属材料]