<strong>AlNbMoZrB</strong>系难熔高熵合金的<strong>Kr</strong>离子辐照损伤行为

doi:10.11901/1005.3093.2022.526

材料研究学报

2023, Vol. 37

Issue (9): 641-648 DOI: 10.11901/1005.3093.2022.526

研究论文

本期目录 | 过刊浏览

AlNbMoZrB系难熔高熵合金的Kr离子辐照损伤行为

毛建军¹, 富童², 潘虎成¹(

), 滕常青¹, 张伟¹^,², 谢东升², 吴璐¹

^1.中国核动力研究设计院第一研究所成都 610041
^2.东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室沈阳 110819

Kr Ions Irradiation Damage Behavior of AlNbMoZrB Refractory High-entropy Alloy

MAO Jianjun¹, FU Tong², PAN Hucheng¹(

), TENG Changqing¹, ZHANG Wei¹^,², XIE Dongsheng², WU Lu¹

^1.The First Sub-Institute, Nuclear Power Institute of China, Chengdu 610005, China
^2.Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

毛建军, 富童, 潘虎成, 滕常青, 张伟, 谢东升, 吴璐. AlNbMoZrB系难熔高熵合金的Kr离子辐照损伤行为[J]. 材料研究学报, 2023, 37(9): 641-648.
Jianjun MAO, Tong FU, Hucheng PAN, Changqing TENG, Wei ZHANG, Dongsheng XIE, Lu WU. Kr Ions Irradiation Damage Behavior of AlNbMoZrB Refractory High-entropy Alloy[J]. Chinese Journal of Materials Research, 2023, 37(9): 641-648.

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摘要:

基于电弧熔炼法将可燃毒物硼(B)元素添加到AlNbMoZr基难熔高熵合金(RHEA)中，制备出一种具有中子毒物特性的高强度新型核用RHEA材料。对其进行强度为4 MeV的Kr离子辐照实验，研究了这种材料的Kr离子辐照损伤行为。室温压缩结果表明，AlNbMoZrB合金具有优异的力学性能，其压缩屈服强度可达1180 MPa，压缩强度约为1274 MPa，塑性约为4.8%。对辐照前后这种合金的相结构和显微组织演化的分析结果表明，AlNbMoZrB合金具有典型的枝晶组织，其中枝晶区为无序BCC结构基体相，枝晶间区由FCC结构的Al-Zr相及α-Zr相组成，经Kr离子辐照后α-Zr相发生非晶化转变，还产生了高密度<100>和1/2<111>型位错环。在室温辐照条件下位错环的体积密度约为4.11×10²² m^-3，尺寸为12~16 nm；在300℃辐照条件下位错环的体积密度降低到约1.63×10²² m^-3，尺寸增大到23~27 nm。

关键词 ：金属材料, 难熔高熵合金, 力学性能, 离子辐照, 位错环, 显微组织

Abstract：

As a burnable poison element, boron (B) has been successfully added into the AlNbMoZr based refractory high-entropy alloy (RHEA) via arc melting method, thus a novel high strength nuclear RHEA material with neutron toxic properties was developed. Hence, the alloy was subjected to irradiation of Kr ions of 4 MeV intensity to assess its irradiation damage behavior in terms of its microstructure and mechanical property evolution. The results of room temperature compression testing show that AlNbMoZrB alloy has excellent mechanical property with compression yield strength ~1180 MPa, fracture strength ~1274 MPa, and plasticity ~4.8%. By comparatively examining the phase structure and microstructure evolution of AlNbMoZrB alloy before and after irradiation, it is found that AlNbMoZrB alloy has a typical dendrite structure, in which the dendrite region is a matrix phase with disordered BCC structure, and the interdendrite region is composed of FCC structure Al-Zr phase and α-Zr phase. After irradiation with Kr ions, the α-Zr phase underwent an amorphous transformation. At the same time, high density <100> and 1/2<111> dislocation loops are also generated. The volume density of the dislocation loop is ~4.11×10²² m^-3 and the size is between 12 nm and 16 nm after subjected Kr ions irradiation at room temperature. The volume density of the dislocation loop decreased to ~1.63×10²² m^-3 and the size increased to 23~27 nm after subjected the same Kr ions irradiation at 300℃.

Key words： metallic materials refractory high entropy alloy mechanical properties ion irradiation dislocation loop microstructure

收稿日期: 2022-10-08

ZTFLH:

TG113

基金资助:国家自然科学基金(U2067218);国家自然科学基金(U2167213);国家自然科学基金(U2241235);四川省科技厅项目(21MZGC0400);四川省科技厅项目(2022JDJQ0021);中国核工业集团有限公司青年英才菁英项目(CNNC-2021-31);反应堆燃料与材料国家重点实验室项目(6142A06190510);中央高校基本业务费项目(N2202020)

通讯作者: 潘虎成，教授，panhc@atm.neu.edu.cn，研究方向为变形强化镁合金及材料辐照效应

Corresponding author: PAN Hucheng, Tel: (024)83687746, E-mail: panhc@atm.neu.edu.cn

作者简介: 毛建军，男，1984年生，博士

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图1 铸态AlNbMoZrB合金的压缩应力-应变曲线和XRD谱

表1 铸态合金的室温压缩屈服强度、断裂强度和压缩率

图2 铸态AlNbMoZrB合金的背散射图、EDS面和点扫描图

表2 铸态AlNbMoZrB合金的EDS点扫描结果

图3 铸态AlNbMoZrB合金低电压下的背散射图和面扫图

图4 AlNbMoZrB在4.8×1015/cm2 Kr离子辐照条件下的室温TEM形貌

表3 AlNbMoZrB合金室温辐照点扫描结果

表4 AlNbMoZrB合金在300℃辐照的点扫描结果

图5 室温辐照和300℃辐照AlNbMoZrB合金双束条件下的TEM形貌

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