作者
Scott Whalen, Matthew Olszta, Md Reza-E-Rabby, Timothy Roosendaal, Tianhao Wang, Darrell Herling, Brandon Scott Taysom, Sarah Suffield, Nicole Overman
发表日期
2021/11/1
期刊
Journal of Manufacturing Processes
卷号
71
页码范围
699-710
出版商
Elsevier
简介
Shear assisted processing and extrusion (ShAPE) was used to extrude aluminum alloy 7075 tubing at speeds up to 12.2 m/min without surface tearing. This work presents the first experimental evidence for high-speed extrusion of 7075, which improves upon conventional extrusion where 2.0 m/min is the limit. The increased speed is primarily attributed to more extensive shear deformation, compared to conventional extrusion, which results in a high density of low angle grain boundaries that facilitate continued deformation and delay the onset of surface tearing. Mechanical testing after heat treating to the T6 condition provided an ultimate tensile strength of 565.3 ± 4.6 MPa, yield strength of 495.7 ± 8.7 MPa, and elongation of 16.4 ± 1.0%. Strength values exceed the ASTM International minimum standard and are on par with American Society for Metals (ASM) typical values, while elongation was substantially …
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