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Influence of Annealing on Microstructural Evolution, Precipitation Sequence, and Fracture Toughness of Cryorolled Al–Cu–Si Alloy

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Abstract

Microstructural evolution, precipitation sequence, and fracture toughness of cryorolled Al 2014 alloy subjected to annealing treatment were investigated in the present work. Al 2014 alloy was solutionized (ST) and subjected to cryorolling (CR) up to effective true strain of 2.3. The CR Al 2014 alloy samples were annealed (AN) at temperatures ranging from 100 to 350 °C for the duration of 45 min. TEM and XRD studies of the CR and CR + AN were made to understand its precipitation kinetics. Fracture toughness tests were performed on CR and CR + AN alloy, and its deformation behavior was correlated with microstructural features. The improvement in fracture toughness K ee (23.06–37.8 MPa √m) of CR Al 2014 alloy was observed as compared to ST alloy. The fracture toughness was retained up to 200 °C for CR alloy, but it started decreasing beyond 200 °C. The improvement in fracture toughness of cryorolled Al 2014 alloy at low-temperature annealing from 100 to 200 °C is attributed to the formation of GP zones and metastable phase θ′. However, beyond temperature 200 °C, fracture toughness has reduced due to combined effect of recovery, recrystallization, and formation of stable coarser phase such as θ and λ.

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Authors and Affiliations

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

    Amit Joshi, K. K. Yogesha, Nikhil Kumar & R. Jayaganthan

  2. Department of Engineering Design, Indian Institute of Technology, Chennai, 600036, India

    R. Jayaganthan

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  1. Amit Joshi
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Joshi, A., Yogesha, K.K., Kumar, N. et al. Influence of Annealing on Microstructural Evolution, Precipitation Sequence, and Fracture Toughness of Cryorolled Al–Cu–Si Alloy. Metallogr. Microstruct. Anal. 5, 540–556 (2016). https://doi.org/10.1007/s13632-016-0313-x

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