锂对挤压铍铝复合材料断裂特性及力学性能的影响

The Influence of Li on the Fracture Characteristics and Mechanical Properties of Extruded Beryllium-Aluminum Composites.

作者信息

Li Wentong, Xia Yixiao, Sun Yutong, Hu Juanrui, Hao Leilei, Liu Yun, Ju Boyu, Chen Guoqin, Yang Wenshu

机构信息

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China.

出版信息

Materials (Basel). 2025 Feb 27;18(5):1055. doi: 10.3390/ma18051055.

DOI:10.3390/ma18051055

PMID:40077282

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11901284/

Abstract

Alloying is an important method to improve the mechanical properties of beryllium-aluminum composites. In this study, two kinds of beryllium-aluminum composites with and without Li were prepared by pressure impregnation method and extrusion, and the effects of Li on the microstructure and mechanical properties of beryllium-aluminum alloy were investigated by XRD, SEM and tensile test. The results show the addition of Li enhances the absorption of oxygen and nitrogen in the alloy; however, there is no significant change in the material's density, which remains at 2.07 g/cm. Despite an exacerbation of debonding phenomena at the fracture surface of Li-containing beryllium-aluminum alloys and a decrease in ductile dimples density, the yield strength increased from 266.2 MPa to 317.1 MPa, the tensile strength increased from 348.6 MPa to 411.4 MPa, and the elongation only decreased slightly from 2.9% to 2.5%. These experimental results support the design and preparation of high-performance beryllium-aluminum composites.

摘要

合金化是提高铍铝复合材料力学性能的重要方法。本研究采用压力浸渍法和挤压法制备了含锂和不含锂的两种铍铝复合材料，并通过XRD、SEM和拉伸试验研究了锂对铍铝合金微观结构和力学性能的影响。结果表明，锂的加入增强了合金中氧和氮的吸收；然而，材料密度没有显著变化，仍为2.07 g/cm。尽管含锂铍铝合金断裂表面的脱粘现象加剧，韧性凹坑密度降低，但屈服强度从266.2 MPa提高到317.1 MPa，抗拉强度从348.6 MPa提高到411.4 MPa，伸长率仅从2.9%略微降低到2.5%。这些实验结果为高性能铍铝复合材料的设计和制备提供了支持。