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Title
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Precipitation behaviors in Ti-2.3 Wt Pct Cu alloy during isothermal and two-step aging
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Author
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Abstract
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| Time evolution of precipitates related to age-hardening in Ti-2.3 wt pct Cu alloys was investigated by electron microscopy. In isothermal aging at 723 K, the hardness increases continuously owing to precipitation strengthening, whereas in two-step aging where the aging temperature is switched from 673 K to 873 K after 100 hours, the hardness is found to drastically drop after the aging temperature switches. In isothermal aging, metastable and stable precipitates are independently nucleated, whereas characteristic V-shaped clusters of precipitates are observed during the two-step aging. It is revealed by atomic-scale observations that the V-shaped clusters are composed of metastable and stable precipitates and each type of precipitate has a different orientation relationship with the alpha phase: (10 (3) over bar)//(0001)(alpha) and [0 (1) over bar0]//respectively. The drop in hardness during two-step aging can be explained by a synergistic effect of decreased precipitation strengthening and solid solution strengthening. (C) The Minerals, Metals & Materials Society and ASM International 2021 |
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Language
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English
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Source (journal)
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Metallurgical and materials transactions: A: physical metallurgy and materials science. - Metals Park, Ohio
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Publication
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New york
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Springer
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2021
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ISSN
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1073-5623
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DOI
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10.1007/S11661-021-06265-X
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Volume/pages
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52
(2021)
, p. 2760-2772
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ISI
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000644823000001
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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