Superior Strength with Enhanced Fracture Resistance of Al-Mg-Sc Alloy Through Two-Step Cryo Cross Rolling

Vigneshwaran, S and Sivaprasad, K and Narayanasamy, R and Venkateswarlu, K (2019) Superior Strength with Enhanced Fracture Resistance of Al-Mg-Sc Alloy Through Two-Step Cryo Cross Rolling. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 50 (7). pp. 3265-3281. ISSN 10735623

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Abstract

The evolution of microstructure and the preferred orientation during the two-step cross rolling at room (RT) and cryogenic temperatures (CTs) on Al-Mg-Sc alloy were investigated and compared with the unidirectional rolled Al-Mg-Sc alloy in this study. In addition, the effects of two-step cross rolling on tensile, forming and void coalescence behavior were analyzed. After the solution heat treatment, the two-step cross rolling was executed with an initial 25 pct reduction in the unidirectional path and the final 25 pct reduction in the transverse direction. The two-step cross-rolled (TSCR) Al-Mg-Sc alloy at CT showed a higher fraction of sub-micron grains. The TSCR Al-Mg-Sc alloy exhibited brass and copper and a strong S texture. The texture indices and in-plane anisotropy values indicated the highly anisotropic nature of the TSCR Al-Mg-Sc alloy. During tensile deformation, the TSCR Al-Mg-Sc alloy at CT exhibited a strength value of 423 MPa, whereas the TSCR Al-Mg-Sc alloy at RT revealed only 378 MPa. The TSCR Al-Mg-Sc alloy at CT exhibited inferior formability compared with the TSCR Al-Mg-Sc alloy at RT and the solution heat-treated base alloy. The formability of the TSCR Al-Mg-Sc alloy was evaluated through the combined forming and fracture limit diagram (CFFLD). The presence of higher Goss-oriented grains enhanced the fracture resistance of the TSCR Al-Mg-Sc alloy at CT. Furthermore, consistency was found between the evaluated void coalescence parameters and the CFFLD.

Item Type:	Article
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User:	Mrs SK Pratibha
Date Deposited:	23 Nov 2021 11:38
Last Modified:	23 Nov 2021 11:38
URI:	http://nal-ir.nal.res.in/id/eprint/13381

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