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<p>In an application such as B-pillars for automobiles, the ideal component would encompass high strength to sustain the intrusive loads encountered and significant toughness for energy absorption to enable enhanced crash resistance and occupant safety. In this study, shear-assisted processing and extrusion (ShAPE) was used to create thin strips consisting of a high strength region and a large elongation region in AA5182 aluminum alloy. The ShAPE extruded tube with a wall thickness that varied from 2.0 to 1.0&#xa0;mm along the length was rolled to a uniform thickness of 0.9&#xa0;mm to create a gradient in cold work along the length, which induced variable properties in the strip. Mechanical property characterization including hardness and tensile property characterization was performed to quantify property differences. Furthermore, electron microscopy was used to understand the underlying variations in microstructure. After cold rolling to 0.9&#xa0;mm, the previously 2&#xa0;mm wall thickness region exhibited YS of 297&#xa0;MPa with 9.6% total elongation, while the 1&#xa0;mm wall thickness region exhibited YS of 219&#xa0;MPa with 18% total elongation. Average grain size measured based on equivalent circle diameter from large scan regions in 2 and 1&#xa0;mm were 10.5 ± 3.6 and 11.0 ± 3.7&#xa0;μm, respectively. Results from the initial investigation showed the feasibility of this approach to obtain variable properties in a work hardened Al alloy.</p>

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Spatially Varying Mechanical Properties in AA5182 Aluminum Alloy Strip

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Mageshwari Komarasamy,
  • Benjamin Schuessler,
  • Nathan Canfield,
  • Xiaolong Ma,
  • Scott Whalen

摘要

In an application such as B-pillars for automobiles, the ideal component would encompass high strength to sustain the intrusive loads encountered and significant toughness for energy absorption to enable enhanced crash resistance and occupant safety. In this study, shear-assisted processing and extrusion (ShAPE) was used to create thin strips consisting of a high strength region and a large elongation region in AA5182 aluminum alloy. The ShAPE extruded tube with a wall thickness that varied from 2.0 to 1.0 mm along the length was rolled to a uniform thickness of 0.9 mm to create a gradient in cold work along the length, which induced variable properties in the strip. Mechanical property characterization including hardness and tensile property characterization was performed to quantify property differences. Furthermore, electron microscopy was used to understand the underlying variations in microstructure. After cold rolling to 0.9 mm, the previously 2 mm wall thickness region exhibited YS of 297 MPa with 9.6% total elongation, while the 1 mm wall thickness region exhibited YS of 219 MPa with 18% total elongation. Average grain size measured based on equivalent circle diameter from large scan regions in 2 and 1 mm were 10.5 ± 3.6 and 11.0 ± 3.7 μm, respectively. Results from the initial investigation showed the feasibility of this approach to obtain variable properties in a work hardened Al alloy.