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Correlation of Tensile Properties and Fracture Toughness with Microstructural Features for Al–Li 8090 Alloy Processed by Cryorolling and Post-rolled Annealing

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Abstract

The influence of cryorolling and post-deformation annealing on the tensile and fracture behaviour of aluminium–lithium (Al 8090) alloy is reported in the present investigation. The solution-treated (ST) alloy was cryorolled (CR) up to the true strain of 2.3 to achieve ultrafine-grained (UFG) microstructure and then annealed at different temperature ranging from 100 to 350 °C. CR samples showed a significant increase in tensile strength (~ 373 MPa), hardness (~ 120 HV), and fracture toughness [KQ (21.9 MPa \( \surd m \)), Kee [27.9 MPa \( \surd m \)), J integral (21.8 kJ/m2)], while huge drop in ductility of CR alloy is observed as compared to coarser grain ST alloy. After annealing in the temperature ranging from 100 to 350 °C, the significant changes in the tensile and fracture behaviour of bulk UFG Al 8090 alloy were noticed. The tensile strength and fracture toughness were gradually improved up to the temperature 150 °C and observed to be maximum (~ 561 MPa) at 150 °C, while beyond this temperature, a significant drop in these properties was observed. The improved tensile and fracture properties of cryorolled followed by annealed alloy at 150 °C could be attributed to the precipitation of S′ (Al2CuMg) and \( \delta \) (Al3Li) phase as observed from XRD and TEM studies.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Govind Ballabh Pant Institute of Engineering and Technology, Pauri, 246194, India

    Saurabh Gairola, Amit Joshi & Pankaj Rawat

  2. Department of Mechanical Engineering, Hemwati Nandan Bahuguna Garhwal University, Srinagar, 246174, India

    Brijesh Gangil

  3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Raviraj Verma

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  1. Saurabh Gairola
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Correspondence to Amit Joshi.

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Gairola, S., Joshi, A., Gangil, B. et al. Correlation of Tensile Properties and Fracture Toughness with Microstructural Features for Al–Li 8090 Alloy Processed by Cryorolling and Post-rolled Annealing. Trans Indian Inst Met 72, 1743–1755 (2019). https://doi.org/10.1007/s12666-019-01641-z

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