Effect of grain size on α-variant selection in a ZrTiAlV alloy  

作　　者：LI FeiTao QIU Xi LIAO ZhongNi LUAN BaiFeng ZHANG XinYu LIU RiPing LIU Qing 

机构地区：[1]College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China [2]Nuclear Power Institute of China, Chengdu 610041, China [3]State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

出　　处：《Science China(Technological Sciences)》2019年第6期982-988,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51531005,51571174&51421001);the Fundamental Research Funds for the Central Universities(Grant No.106112017CDJQJ138803);the National Science Foundation for Distinguished Young Scholars of Hebei Province of China(Grant No.E2016203376);the Hundred Excellent Innovative Talents Support Program in Hebei Province(Grant No.SLRC2017056)

摘　　要：Local crystallographic orientation characteristics of grains with different sizes in a ZrTiAlValloy after interrupted cooling from βphase region are investigated by electron backscatter diffraction(EBSD) technique. A statistical analysis of EBSD data shows that bigger parent β grains present weaker variant selection than smaller grains. The relevant influences are studied by comparing the nucleation behavior of grain boundary α(GBα) and succedent growth stage in varisized grains. In-depth analysis indicates that the deviation between pole of GBα and common pole of adjacent parent β grains is responsible for the smaller degree of variant selection inside the bigger parent β grains. The formation of more than one GBα type at the β/β grain boundary with common pole in bigger grains results in obstructing each other for these variants during the following growth stage, while only one type of GBα nucleate at the β/β grain boundary with common pole in smaller grains and it can freely grow into the interior of the grains, leading to stronger variant selection in smaller β grains.Local crystallographic orientation characteristics of grains with different sizes in a ZrTiAlValloy after interrupted cooling from βphase region are investigated by electron backscatter diffraction(EBSD) technique. A statistical analysis of EBSD data shows that bigger parent β grains present weaker variant selection than smaller grains. The relevant influences are studied by comparing the nucleation behavior of grain boundary α(GBα) and succedent growth stage in varisized grains. In-depth analysis indicates that the deviation between pole of GBα and common pole of adjacent parent β grains is responsible for the smaller degree of variant selection inside the bigger parent β grains. The formation of more than one GBα type at the β/β grain boundary with common pole in bigger grains results in obstructing each other for these variants during the following growth stage, while only one type of GBα nucleate at the β/β grain boundary with common pole in smaller grains and it can freely grow into the interior of the grains, leading to stronger variant selection in smaller β grains.

关 键 词：VARIANT selection EBSD BURGERS ORIENTATION RELATIONSHIP NUCLEATION behavior 

分 类 号：TG146.414[一般工业技术—材料科学与工程]