形变量对Ni-5at%W合金晶界特征分布的影响  

Effect of strain on grain boundary character distribution in Ni-5 at%W alloy

作　　者：李龙飞[1] 陈兴品[1] 孙洪福[1] 李晓光[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《材料热处理学报》2015年第6期26-30,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51171215)

摘　　要：应用电子背散射衍射(EBSD)和取向成像显微技术(OIM)研究了形变量对Ni-5 at%W合金退火过程中晶界特征分布(GBCD)的影响。合金经77%、89%和98%冷轧后分别在不同温度下进行退火。试验结果表明:较小的形变量(77%、89%)相比于较高的形变量(98%),前者更容易在随后的再结晶退火过程中激发出更多的低ΣCSL(coincidence site lattice,Σ≤29)特殊晶界。在同一形变量下,随着温度的升高,Σ3的比例随之下降;在相同的退火温度下,随着形变量的增大,Σ3的比例也随之下降。与此同时,小角度晶界含量不断增加,立方织构逐渐尖锐。Effect of strain on grain boundary character distribution of Ni-5 at% W alloy during annealing was investigated by electron back diffraction( EBSD) and orientation imaging microscopy( OIM). The alloy was cold rolled by 77%,89%,98% and then annealed at different temperatures. The results indicate that compared with the larger ones,the smaller deformations( 77% and 89%),can generate more low-ΣCSL( Σ ≤ 29) boundaries( f CSL) during the subsequent recrystallizaton annealing. For the same deformation,the frequencies of Σ3 boundaries decrease as the temperature increases. At the same annealing temperature,the frequencies of Σ3 boundaries also decrease with the increase of deformation and low-angle grain boundary increases as the result of the sharp cube texture.

关 键 词：晶界特征分布 退火孪晶 立方织构 EBSD 

分 类 号：TG146.15[一般工业技术—材料科学与工程]