自生复合Al<sub>11</sub>La<sub>3</sub>/Al共晶材料的轴向拉伸性能及其断裂机制

董洪标; 计永毅; 朱竣; 吕述祖; 钟雪友

自生复合Al₁₁La₃/Al共晶材料的轴向拉伸性能及其断裂机制

北京科技大学, 100083

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出版历程
- 收稿日期: 1995-05-29
- 刊出日期: 1994-05-31

AXIAL TENSILE STRENGTH AND FRACTURE NECHANISM OF IN-SITU COMPOSITE Al₁₁La₃/Al

Bcijing University of Science and Technology, 100083

摘要

摘要: 本文研究了自生复合Al₁₁La₃/Al共晶材料从室温到673K时的轴向拉伸性能和轴向拉伸断裂机制.结果表明:在G=700K/cm、R=11.1μm/s的定向凝固条件下,该材料轴向拉伸性能在室温时为260MPa、在673K时为265MPa.对拉伸过程的动态观察和断口形貌的分析表明:自生复合Al₁₁La₃/Al共晶材料在室温到673K温度范围内,其轴向拉伸断裂机制相同:纤维相Al₁₁La₃的断裂是整个共晶体断裂的控制机制:其轴向拉伸的断裂模型为:弹性变形、裂纹萌生、界面脱粘、搭桥过程、宏观断裂.
- 自生复合材料 /
- Al+(La.Al) /
- 拉伸性能 /
- 断裂机制
Abstract: The aerial tensile properties and fracture mechanism of in-situ composite Al₁₁La₃/Al have been investi,gate;l in the temperature range of 293-693ph.The result is that:the tensil.strength reaches 260 MPa at the norma temperature and:365 MPa at 693K for the alloy under the condition of directioral solidification(G=700K/cm,R=11.1 μm/s).With the study on the tensile process and the fracture morphology,the in-situ composite Al₁₁La₃/Al has the same axial tensile fracture mechanism in the temperature range of 293-693K.The fracture of fiber phase Al₁₁La₃ the critical factor for the fracture of the composite.The fracture model of tensile test is,elastic deformation,cracks neucleation,interface separation cracka propagation and macrofracture.
- In-situ composite /
- Al-(La, Al) /
- tensile properties fracture mechanism /
- undefined