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Author: search.filters.author.Chen, CHSubject: search.filters.subject.TEM

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Now showing 1 - 4 of 4
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    Phase transformations in a Cu-142Al-15.0Ni alloy
    (2002-02-17)
    Chen, CH
    ;
    Liu, TF
    ;
    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    In the as-quenched condition, the microstructure of the Cu-14.2Al-15.0Ni alloy was D0(3) phase containing extremely fine L-J precipitates. Since both fine D0(3) domains with a/2(100) anti-phase boundaries (APBs) and small B2 domains with a/4(111) APBs could be observed, the D0(3) phase existing in the as-quenched alloy should be formed by an A2 --> B2 --> D0(3) continuous ordering transition during quenching. It is worthwhile to note that the a/4(111) APBs have never been observed by other workers in the Cu-Al-Ni ternary alloys before. When the as-quenched alloy was aged at temperatures ranging from 400 to 1000 degreesC for longer times, the phase transformation sequence as the aging temperature increased was found to be (alpha + B2 precipitate) --> (B2 + B2 precipitate) --> B2 --> A2. This transformation has also never been observed by other workers in the Cu-Al-Ni ternary alloys before. (C) 2002 Elsevier Science B.V. All rights reserved.
  • Thumbnail Image
    Item type:Item,
    Phase transformations in a Cu-14.2Al-12.0Ni alloy
    (2002-10-11)
    Chen, CH
    ;
    Liu, TF
    ;
    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    The as-quenched microstructure of the Cu-14.2Al-12.0Ni alloy was D0(3) phase containing extremely fine L-J precipitates, where the D0(3) phase was formed by an A2 --> B2 --> D0(3) continuous ordering transition during quenching. Besides, the addition of nickel to the Cu-14.2Al binary alloy would raise the B2 --> beta transition temperature. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
  • Thumbnail Image
    Item type:Item,
    Phase transformations in a Cu-142Al-15.0Ni alloy
    (2003-02-17)
    Chen, CH
    ;
    Liu, TF
    ;
    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    In the as-quenched condition, the microstructure of the Cu-14.2Al-15.0Ni alloy was D0(3) phase containing extremely fine L-J precipitates. Since both fine D0(3) domains with a/2(100) anti-phase boundaries (APBs) and small B2 domains with a/4(111) APBs could be observed, the D0(3) phase existing in the as-quenched alloy should be formed by an A2 --> B2 --> D0(3) continuous ordering transition during quenching. It is worthwhile to note that the a/4(111) APBs have never been observed by other workers in the Cu-Al-Ni ternary alloys before. When the as-quenched alloy was aged at temperatures ranging from 400 to 1000 degreesC for longer times, the phase transformation sequence as the aging temperature increased was found to be (alpha + B2 precipitate) --> (B2 + B2 precipitate) --> B2 --> A2. This transformation has also never been observed by other workers in the Cu-Al-Ni ternary alloys before. (C) 2002 Elsevier Science B.V. All rights reserved.
  • Thumbnail Image
    Item type:Item,
    Phase transition in a Cu-14.1A1-9.0Ni alloy
    (2003-08-15)
    Chen, CH
    ;
    Yang, CC
    ;
    Liu, TF
    ;
    材料科學與工程學系
    ;
    Department of Materials Science and Engineering
    The phase transition of the Cu-14.1 wt.% Al-9.0 wt.% Ni alloy has been examined by transmission electron microscopy and energy-dispersive X-ray analysis. In the as-quenched condition, the microstructure of the alloy was Do(3) phase that contained extremely fine L-J precipitates. During the early stage of isothermal aging at 500 degreesC, a high density of the extremely fine B2 particles was observed within the extremely thin lamellar gamma(1)' martensite, which was formed by a D0(3) --> gamma(1)' martensitic transformation during quenching. With increasing aging time at 500 degreesC, the isothermal phase transition sequence was found to be D0(3) --> D0(3) --> B2 --> D0(3) + B2 + alpha --> B2 + alpha + gamma(2). This transition significantly differs from that observed by other researchers. Besides, both Kurdjumov-Sachs (K-S) and Nishiyama-Wassermann (N-W) orientation relationships between the B2 particle and the alpha phase could be detected in the aged alloy. (C) 2003 Elsevier Science B.V. All rights reserved.