Abstract
Recent advances in the technologies of powder metallurgy lead to the development of some superplastic aluminium alloys containing a deliberate addition of a large amount of Zr and /or Cr and Mn that exhibit the high strain rates superplasticity. For a few alloy systems, the large elongation more than 500% has been observed over the strain rates of 1×10−1s−1, which rates are two or three orders of magnitude faster than those at which superplasticity is found in conventional superplastic aluminium alloys produced by ingot metallurgy. The high strain-rates superplasticity obtained in both type of fully static recrystallized and dynamic recrystallized P/M aluminium alloys. The decreasing of initial size of grains and/or sub-grains leads to the increasing the strain-rates for superplastic flow in both types of alloys. The refinement of grains or sub-grains size is one of necessary and important to obtain the high strain-rates superplasticity.
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Acknowledgement
The experimental elongation results obtained for P/M aluminium alloys in present work are overviewed in Fig. 10. This shows the new aspect and possibility for the maximum strain rate (not the maximum elongation) of superplastic alloys.
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Higashi, K., Tanimura, S. & Ito, T. Superplasticity in P/M Aluminium Alloys. MRS Online Proceedings Library 196, 385–390 (1990). https://doi.org/10.1557/PROC-196-385
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DOI: https://doi.org/10.1557/PROC-196-385