β-ZrTiAlV合金炉冷过程中的组织演变  

Microstructure evolution ofβ-ZrTiAlV alloy during furnace cooling

作　　者：李飞涛 栾佰峰[1] 廖仲尼 张新宇[2] 刘日平[2] 刘庆[1] LI Fei-tao;LUAN Bai-feng;LIAO Zhong-ni;ZHANG Xin-yu;LIU Ri-ping;LIU Qing(International Joint Laboratory for Light Alloys,Ministry of Education,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]重庆大学材料与科学工程学院教育部轻合金材料国际联合实验室,重庆400044 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《中国有色金属学报》2020年第2期273-282,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51531005,U1867202,51421001);中央高校基本科研业务费(106112017CDJQJ138803)。

摘　　要：结合EBSD和XRD,系统地研究了β-51.1Zr40.2Ti4.5Al4.2V合金在炉冷过程中3种α相(αGB、αWGB和αWI)的形核机制以及α含量对合金性能的影响。结果表明:炉冷过程中,在原β界面处具有{0001}面平行于相邻β晶粒共有{110}面取向特征的α相(αGB)会优先形核;αWGB主要以界面不稳定形核为主,通过继承αGB的取向并向原β晶内生长,从而在晶界附近形成平行板条区;为了协调相变过程中产生的形状应变,αWI通过自协作机制产生三变体团簇,且形成三变体团簇的变体之间相互满足60°/1120取向关系;随着炉冷后保温温度的降低,α相的相对含量增加,合金的硬度增大,且硬度和α相的相对含量存在一定的线性关系。The nucleation mechanism of three kinds ofαphase(αGB,αWGB andαWI)in furnace-coolingβ-51.1Zr40.2Ti4.5Al4.2V alloy and the effect of the relative volume fraction ofαandβphases on mechanical properties were investigated systematically by EBSD and XRD.The results show that theαGB with{0001}pole parallel to the common{110}pole of adjacentβgrains will present preferred nucleation atβgrain boundary.The major nucleation mechanism ofαWGB is interface instability nucleation,therefore,αWGB grains nucleate and grow into the interior of priorβgrains by inheriting the orientation ofαGB.In order to coordinate the strain energy formed during theβ→αtransformation,αWI develops three-variant cluster by so-called self-accommodation mechanism,the three variants are related to each other by an angle/axis pair 60°/1120.With the decrease of furnace-cooling temperature,the relative volume fraction ofαphase increases,resulting in the increasement of hardness.There is a linear relationship between hardness and the relative volume fraction ofαphase.

关 键 词：取向关系 形核机制 自协作机制 EBSD 

分 类 号：TG146.4[一般工业技术—材料科学与工程]