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Anisotropic Low Cycle Behavior of the Extruded 7075 Al Alloy
Jin Ma1, Qiang Wang1, Yongbiao Yang1
1College of Materials Science and Engineering, North University of China, 3 Xueyuan Road, Taiyuan 030051, China.
Materials (Basel, Switzerland)
|August 27, 2021
Summary
Extruded 7075 aluminum alloy shows superior ultimate tensile strength and low cycle fatigue performance along the extrusion direction. This is due to grain morphology, texture, and reduced plastic deformation, enabling better fatigue life prediction.
Area of Science:
- Materials Science
- Mechanical Engineering
- Metallurgy
Background:
- Extruded 7075 aluminum alloy is a critical material in aerospace and automotive industries.
- Understanding anisotropic mechanical properties is crucial for structural integrity.
- Low cycle fatigue (LCF) behavior dictates material performance under cyclic loading.
Purpose of the Study:
- To investigate the quasi-static and LCF behavior of extruded 7075 Al alloy in different directions.
- To correlate microstructure (grain morphology, texture) with mechanical properties.
- To develop LCF life prediction models for this alloy.
Main Methods:
- Quasi-static and LCF testing along extrusion direction (ED), radial direction (RD), and 45° to ED.
- Microstructural analysis including grain morphology and texture measurement.
- Fatigue fracture surface characterization and striation spacing analysis.
Main Results:
- Specimens tested along the ED exhibited higher ultimate tensile strength (UTS) and LCF properties.
- Anisotropic grain morphology and texture significantly influenced mechanical response.
- ED specimens showed narrower fatigue striation spacing, indicating lower plastic deformation per cycle.
Conclusions:
- The extrusion direction offers optimal mechanical and LCF performance for 7075 Al alloy.
- Grain boundaries, crystallographic texture, and plastic deformation are key factors controlling fatigue behavior.
- Established models can predict LCF life based on directional strain responses.
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