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Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains
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DOI：10.3390/ma16020727.png)
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Abstract
En 中文
This study aims to achieve an ultrafine-grained (UFG) Al 2024 alloy superplasticity at temperatures lower than the traditional ones for commercial Al alloys (400-500 degrees C). The UFG structure with a mean grain size of 100 nm produced in the alloy by high-pressure torsion at room temperature provided a very high strength-microhardness (HV0.1) of 286 +/- 4, offset yield strength (sigma(0.2)) of 828 +/- 9 MPa, and ultimate tensile strength (sigma(UTS)) of 871 +/- 6 MPa at elongation to failure (delta) of 7 +/- 0.2%. Complex tensile tests were performed at temperatures from 190 to 270 degrees C and strain rates from 10(-2) to 5 x 10(-5) s(-1), and the values of flow stress, total elongation and strain rate-sensitivity coefficient were determined. The UFG alloy was shown to exhibit superplastic behavior at test temperatures of 240 and 270 degrees C. For the first time, 400% elongation was achieved in the alloy at an unusually low temperature of 270 degrees C (0.56 T-m) and strain rate of 10(-3) s(-1). The UFG 2024 alloy after superplastic deformation was found to have higher strength (150-160 HV) than that after the standard strengthening heat treatment T6.
Keywords:
superplasticity
aluminum alloys
ultrafine-grained materials
strength
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