Effect of trace Zr on microstructure and mechanical properties of deep cryogenic rolled Al-Cu-Mg alloy

doi:10.13251/j.issn.0254-6051.2023.09.029

Abstract

Abstract: Effect of trace Zr addition on microstructure and mechanical properties of deep cryogenic rolled Al-Cu-Mg alloy sheet was studied by means of optical microscope (OM), electronic universal testing machine, X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the trace Zr addition refines the Al-Cu-Mg alloy grains, and makes the size of second-phase particles reduce and more evenly distribute, mainly as the θ-Al₂Cu phase. The addition of Zr effectively improves mechanical properties of the Al-Cu-Mg alloy, the tensile strength, elongation and Brinell hardness of which are 610 MPa, 10.3% and 176 HBW, and increases by 67 MPa, 2.5% and 22 HBW relative to the Al-Cu-Mg alloy without Zr addition, respectively. The contribution of dislocation enhancement is significant to the strength enhancement of the Al-Cu-Mg-Zr alloy, reaching 325 MPa. In addition, the Zr addition enhances the texture pole density of the Al-Cu-Mg alloys in the (111), (200) and (220) crystal planes after deep cryogenic rolling, but the texture type is not changed.

Key words: Al-Cu-Mg alloy, Zr addition, deep cryogenic rolling, microstructure, mechanical properties, texture

CLC Number:

TG146.2

Xie Shangheng, Sun Youping, Zhu Jiaxin, Fang Dejun. Effect of trace Zr on microstructure and mechanical properties of deep cryogenic rolled Al-Cu-Mg alloy[J]. Heat Treatment of Metals, 2023, 48(9): 174-179.

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