Effect of Annealing on Thermal Stability, Precipitate Evolution, and Mechanical Properties of Cryorolled Al 7075 Alloy |
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Authors: | Sushanta Kumar Panigrahi and R Jayaganthan |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India;(2) Present address: Department of Material Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA; |
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Abstract: | The effect of annealing on microstructural stability, precipitate evolution, and mechanical properties of cryorolled (CR)
Al 7075 alloy was investigated in the present work employing hardness measurements, tensile test, X-ray diffraction (XRD),
differential scanning calorimetry (DSC), electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM).
The solution-treated bulk Al 7075 alloy was subjected to cryorolling to produce fine grain structures and, subsequently, annealing
treatment to investigate its thermal stability. The recrystallization of CR Al 7075 alloys started at an annealing temperature
of 423 K (150 °C) and completed at an annealing temperature of 523 K (250 °C). The CR Al 7075 alloys with ultrafine-grained
microstructure are thermally stable up to 623 K (350 °C). Within the range of 523 K to 623 K (250 °C to 350 °C), the size
of small η phase particles and AlZr3 dispersoids lies within 300 nm. These small precipitate particles pin the grain boundaries due to the Zener pinning effect,
which suppresses grain growth. The hardness and tensile strength of the CR Al 7075 alloys was reduced during the annealing
treatment from 423 K to 523 K (150 °C to 250 °C) and subsequently it remains constant. |
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