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Published on: February 1, 2017
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Microstructure Evolution of 7075 Aluminum Alloy by Rotary
Hui Cao1, Yongbiao Yang1, Xing Zhang1
1College of Materials Science and Engineering, North University of China, 3 Xueyuan Road, Taiyuan 030051, China.
Materials (Basel, Switzerland)
|February 25, 2022
Summary
Rotary back extrusion (RBE) enhances 7075 aluminum alloy processing by increasing strain and improving uniformity. This novel method refines grain structure, boosting micro-hardness compared to conventional back extrusion (CBE).
Area of Science:
- Materials Science
- Manufacturing Engineering
- Metallurgy
Background:
- Conventional back extrusion (CBE) has limitations in producing high-performance metal components.
- 7075 aluminum alloy is a high-strength material requiring optimized processing techniques.
- Producing intricate shapes like cup-shaped pieces demands advanced forming methods.
Purpose of the Study:
- To introduce and evaluate a rotary back extrusion (RBE) process for manufacturing 7075 aluminum alloy cup-shaped pieces.
- To compare the RBE process with conventional back extrusion (CBE) in terms of material deformation and microstructure.
- To investigate the effects of RBE on strain distribution, dynamic recrystallization, grain refinement, and micro-hardness.
Main Methods:
- Experimental investigation of RBE on a Gleeble-3500 testing machine at 400 °C.
- Comparative analysis with conventional back extrusion (CBE).
- Microstructural analysis using optical microscopy and scanning electron microscopy.
- Process simulation using DEFORM-3D software.
Main Results:
- RBE significantly increased equivalent strain and deformation uniformity compared to CBE.
- RBE led to higher accumulated and shear strain, enhancing overall deformation.
- Increased dynamic recrystallization and obvious grain refinement were observed in RBE samples.
- RBE samples exhibited higher micro-hardness than CBE samples, attributed to grain refinement strengthening.
- Distinct metal flow patterns were identified between RBE and CBE processes.
Conclusions:
- Rotary back extrusion (RBE) is a superior method for producing high-performance 7075 aluminum alloy cup-shaped pieces.
- The RBE process effectively enhances strain, promotes grain refinement, and increases micro-hardness.
- Understanding the differing metal flow laws of RBE and CBE is crucial for process optimization.
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