Nano-refinement of the face-centered cubic Zr(Fe,Cr)2 secondary phase particles in Zircaloy-4 alloy via localized-shearing/bending-driven fracture under high-temperature compression

被引：0

作者：

Han, Fuzhou ^{[1
,2
]}

Li, Geping ^{[1
,2
]}

Yuan, Fusen ^{[1
,2
]}

Guo, Wenbin ^{[1
,2
]}

Ren, Jie ^{[1
,2
]}

Wang, Qichen ^{[1
,2
]}

Zhang, Yingdong ^{[1
,2
]}

Muhammad, Ali ^{[1
,2
]}

Liu, Chengze ^{[1
,2
]}

Gu, Hengfei ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2023年 / 165卷

关键词：

Secondary phase particles; Nano -refinement mechanism; Shearing and bending fracture modes; Zirconium alloys; High -temperature compression; LAVES PHASE; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; CORROSION-RESISTANCE; PLASTIC-DEFORMATION; ZIRCONIUM ALLOYS; COHERENCY LOSS; ELEMENTS SN; CR; NB;

D O I：

10.1016/j.jmst.2023.04.063

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanoparticles are extensively introduced to improve the mechanical, physical, and chemical proper-ties of alloys. In the present study, the underlying nano-refinement mechanisms of face-centered cubic Zr(Fe, Cr)2 secondary phase particles (SPPs) that precipitated in Zircaloy-4 alloy under high-temperature compression were investigated in detail by utilizing high-resolution transmission electron microscopy (HRTEM) and conventional TEM techniques. The frequently observed Zr(Fe, Cr)2 SPPs were incoherent with the matrix and exhibited brittle fracture behaviors without measurable plasticity. HRTEM observa-tions revealed two mechanisms underlying the nano-refinement of incoherent micro-sized SPPs via local-ized shear fracture on {11 2 over bar }SPP and nanoprecipitate-assisted bending fracture, respectively. The latter was, for the first time, found to occur when the movements of large SPPs were blocked by nanometer-sized SPP during alloy deformation. Accordingly, two force models were proposed to visualize their potential nano-refinement processes. The knowledge attained from this study sheds new light on the deformation behaviors of Zr(Fe, Cr)2 SPPs and their associated size refinement mechanisms under high-temperature compression, and is expected to greatly benefit the process optimization of zirconium alloys to achieve precipitate nano-refinement.& COPY; 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：8 / 16

页数：9