کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1611505 1516294 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure formation in γ–γ′ Co–Al–W–Ti alloys during directional solidification
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Microstructure formation in γ–γ′ Co–Al–W–Ti alloys during directional solidification
چکیده انگلیسی


• Microstructure formation process in Co–Al–W–Ti alloys is determined.
• The solidification path of the alloys is presented.
• The alloys are resistant to the grain defect formation during directional solidification.

The microstructure formation process in Co–Al–W–Ti alloys was investigated through quenching performed during directional solidification. The phase transition route of the Co–Al–W–Ti alloys during directional solidification is determined as follows: L → L + γ → L + γ + (β + γ′) → L + γ + γ′ + (β + γ′) → γ + γ′ + β + (β + γ′). The eutectic (β + γ′), primary γ′ and β are orderly deposited in terminal stages of solidification. The eutectic γ′ and β are well distributed and nucleate in random directions. The γ′ particles are precipitated initially from the interdendritic Al-rich regions and subsequently from the dendritic region. The sizes of the γ′ particles close to the primary γ′ and β phases are greater than that of the particles far from them. Since the growth of eutectic colonies restricts the interdendritic liquid convection at earlier stage of the terminal solidification, Co–Al–W–Ti alloys are resistant to the grain defect formation and suitable for fabricating single crystal components.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 599, 25 June 2014, Pages 159–163
نویسندگان
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