Strain transfer behavior and crystallographic mechanism of crack initiation during cyclic deformation in zirconium  

作　　者：Xiangkang Zeng Conghui Zhang Wenguang Zhu Mingliang Zhu Tongguang Zhai Chi Ma Tingchuang Shu KangKai Song 

机构地区：[1]School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China [2]Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China [3]School of Materials Science and Engineering,Shandong Jianzhu University,Jinan 250101,China

出　　处：《Journal of Materials Science & Technology》2023年第31期234-246,共13页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52275161);International Joint Research Center for Value-added Metallurgy and Processing of Non-ferrous Metals(Grant No.2019SD0010);Qin Chuangyuan“Scientist+Engineer”Team Construction in Shaanxi Province(Grant No.2022KXJ-145);Innovation Talent Promotion Program-Science and Technology Innovation Team(Grant No.2023-CX-TD-50).

摘　　要：Fully-reversed cyclic deformation of a pure Zr(a thickness of 17 mm)was conducted at two different strain amplitudes(0.4%and 0.8%)to investigate the deformation and crack initiation behaviors based on slip trace analysis.It was found that prismaticaslip with a higher Schmid Factor(m>0.4)was the dominant deformation mode.The grains containing persistent slip bands(PSBs)tended to go towards[1210]pole and the Schmid Factor had a critical value of 0.4 above which prismatic and pyramidal slip were dominant.Fatigue cracks were mainly initiated at PSBs and grain boundaries(GBs).It showed that 61.1%of the cracks were PSB cracks under a strain amplitude of 0.4%,while it decreased to 53.5%at a strain amplitude of 0.8%.PSB cracks were mainly parallel to prismaticaslip with higher Schmid Factor while some cracks tended to be initiated at GBs with higher misorientation angles.The interaction of PSBs with GBs would result in strain transferring to the neighboring grain.Strain transfer was more likely to occur at the condition of the higher geometrical compatibility factor m,and lower residual Burgers vectorb,which could reduce strain localization.

关 键 词：Fatigue crack initiation Crystallographic orientation PSBS GBS Strain transfer 

分 类 号：TG146[一般工业技术—材料科学与工程]