期刊
SCRIPTA MATERIALIA
卷 209, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.114390
关键词
Compositional patterning; Pb-Sn alloys; Severe plastic deformation; Superplasticity; Tube high-pressure shearing
类别
资金
- National Key R&D Program of China [2017YFA0204403]
- National Natural Science Foundation of China [52074160]
- European Research Council [267464-SPDMETALS]
Superplastic Pb-Sn alloys with exceptional elongation were produced via tube high-pressure shearing (t-HPS) starting from elemental solid bulks. This unprecedented room temperature superplasticity is attributed to equiaxed grains and well-mixed Pb and Sn domains in nearly equal proportions.
Superplastic Pb-Sn alloys were produced via tube high-pressure shearing ( t-HPS), in a single step start-ing from elemental solid bulks. A Pb-40 wt% Sn alloy showed an exceptional superplastic elongation as high as similar to 1870% at a strain rate of 1.0 x 10 -3 s -1 at room temperature, thereby elevating the optimum strain rate for maximum elongation under these conditions by more than one order of magnitude over conventional cast Pb-Sn alloys. This unprecedented room temperature superplasticity is attributed to the equiaxed grains having uniform sizes of the order of one micrometer, and in particular to the well-mixed domains of Pb and Sn in nearly equal proportions. This microstructure cannot be attained in cast eutec-tic or hypoeutectic alloys through conventional thermomechanical processing, but instead it is a direct outcome of t-HPS-generated compositional patterning at room temperature. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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