焦世舜,汪佐瑾,周珍珍,曹睿

• 1:兰州理工大学材料科学与工程学院有色金属先进加工与再利用国家重点实验室
• 2:兰州兰石石油装备工程股份有限公司工艺部加工室
• 3:哈尔滨焊接研究院有限公司

摘要(Abstract)：

对铸态AlCoCrFeNi_(2.1)共晶高熵合金的拉伸强度、压缩强度以及折弯强度进行了测试和分析，同时通过原位拉伸实验对其断裂机理进行分析。结果表明：铸态AlCoCrFeNi_(2.1)共晶高熵合金表现出优异的力学性能，其拉伸强度为1005 MPa,断裂应变为15.4%。合金的拉伸断裂形式为脆性断裂加韧性断裂的混合断裂模式，体心立方相B2发生脆性穿晶断裂形成解理面，面心立方相产生塑性变形，微孔不断汇聚长大最终断裂从而形成塑性断裂的韧窝形貌。通过原位拉伸实验，发现在单轴拉应力作用下，面心立方相首先产生塑性变形，而体心立方相不发生塑性变形，仅仅储存大量内应力，之后在体心立方相薄弱区形成微裂纹释放应力；伴随载荷持续增大在裂纹尖端产生应力集中效应，促使该裂纹不断扩展，同时又有新的微裂纹在附近产生；继续增大载荷微裂纹逐渐融合，形成主裂纹，伴随主裂纹扩展同时形成新的微裂纹；形成“生成微裂纹-扩展-聚合-形成主裂纹-进一步扩展”的循环，直至最终断裂。

关键词(KeyWords)： 高熵合金;拉伸;原位拉伸;断裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52175325,51761027)

作者(Author): 焦世舜,汪佐瑾,周珍珍,曹睿

DOI: 10.13289/j.issn.1009-6264.2022-0131

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