Radiation induced segregation in titanium diboride

被引：2

作者：

Wei, Shuguang ^{[1
]}

Qureshi, Muhammad Waqas ^{[1
]}

Xi, Jianqi ^{[2
]}

Kim, Jun Young ^{[1
]}

Wang, Xing ^{[3
]}

Wei, Jingrui ^{[1
]}

Su, Ranran ^{[4
]}

Liu, Longfei ^{[1
]}

Nachlas, William O. ^{[5
]}

Perepezko, John H. ^{[1
]}

Zhang, Hongliang ^{[6
]}

Szlufarska, Izabela ^{[1
]}

机构：

[1] Univ Wisconsin Madison, Dept Mat Sci & Engn, Madison, WI 53706 USA

[2] Univ Illinois Champaign Urbana, Dept Nucl Plasma & Radiol Engn, Urbana, IL 61801 USA

[3] Penn State Univ, Dept Nucl Engn, University Pk, PA 16802 USA

[4] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China

[5] Univ Wisconsin Madison, Dept Geosci, Madison, WI 53706 USA

[6] Fudan Univ, Inst Modern Phys, Shanghai 200433, Peoples R China

来源：

ACTA MATERIALIA | 2024年 / 267卷

关键词：

Radiation induced segregation; Titanium diboride; Defect migration; Anti-site defects; GRAIN-BOUNDARY SEGREGATION; STRESS-CORROSION CRACKING; IRRADIATION; COATINGS; DAMAGE; MECHANISMS; DEPENDENCE; POINTS;

D O I：

10.1016/j.actamat.2024.119739

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Radiation-induced segregation (RIS) is one of the most dramatic changes that can occur at grain boundaries (GBs) during irradiation. In ceramics, RIS has been rarely studied and the underlying mechanisms are not well understood. Here, we used a combination of experiments and simulations to demonstrate RIS in TiB2. Specifically, we found that radiation causes a significant B depletion and a modest Ti enrichment in the GB regions. We demonstrate that B depletion is a result of the formation of BI-VTi complex and the migration of B vacancies to the GB, where the BI represents B interstitial and VTi represents the Ti vacancy. The Ti enrichment is driven by the differences between the diffusivities of Ti interstitials and vacancies. The distinct RIS mechanisms found in TiB2 shed new light on the relation between the complex energy landscape and defect evolution in ceramics.

引用

页数：10

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