کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10656296 | 1005481 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reversible martensite transformations in thermal cycled polycrystalline Cu-13.7%Al-4.0%Ni alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
A polycrystalline copper alloy with 13.7 wt% aluminum and 4.0 wt% nickel, produced by plasma fusion followed by injection molding, was investigated for the reversible martensitic transformations (RMT) occurring in association with load-free thermal cycling treatments (TCT's). The as-received quenched alloy was subjected to distinct TCT's up to 500 cycles within the temperature interval from 258 K (below Mf) to 373 K (above Af). Each distinct TCT was finished at room temperature (RT) either by half cooling cycle (258 K to RT) or by half heating cycle (373 K to RT). Transformations were characterized by X-ray diffraction, differential scanning calorimetry, optical microscopy and microhardness. The results revealed a complex sequence of transformations involving the high temperature β1 phase, the metastable γ1Ⲡand β1Ⲡmartensitic phases, and the intermediate Al7Cu4Ni phase, known as the R phase. Depending on the number of cycles and the finishing way, the sequence of transformations was partial or complete. The RMT with TCT promotes different changes in the microstructure, including an apparent pull out of grains. Microhardness was also sensibly affected owing to the complex participation of different phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 688, Part B, 15 December 2016, Pages 436-446
Journal: Journal of Alloys and Compounds - Volume 688, Part B, 15 December 2016, Pages 436-446
نویسندگان
Elaine C. Pereira, Lioudmila A. Matlakhova, Anatoly N. Matlakhov, Carlos J. de Araújo, Carlos Y. Shigue, Sergio N. Monteiro,