کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1625728 | 1516433 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hardening and overaging mechanism of a commercial Au-Ag-Cu-Pd dental alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
To reveal the aging behaviour and age-hardening mechanism of an Au-Ag-Cu-Pd alloy with small amounts of Pt, Zn and Ir, the hardness changes, phase transformation and changes in microstructure and element distribution during the aging process were observed. The specimen alloy showed apparent age-hardenability at the aging temperature of 400 °C. By aging, the hardness of the solution-treated specimen began to increase and reached a maximum value, and then, the hardness decreased continuously by further aging. The solution-treated specimen was composed of the Ag-Au-based α1 matrix containing Cu and the PdZn particle-like structures containing Cu and Pt. By aging the solution-treated specimen at 400 °C, the Ag-Au-based α1 matrix was replaced by the lamellar structures of the solute-depleted αâ²1 matrix and the AuCu I precipitates. The hardness increase in the early stage of the aging process seemed to be caused by the nucleation of the AuCu I phase from the matrix which induced the formation of lattice strains in the interface between the matrix and the AuCu I phase. The hardness decrease in the later stage of the aging process was caused by the coarsening and granulation of the AuCu I precipitates which released the strains that formed in the early stage of the AuCu I precipitation from the matrix. The PdZn particle-like structures did not contribute to the hardness increase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 441, Issues 1â2, 30 August 2007, Pages 124-130
Journal: Journal of Alloys and Compounds - Volume 441, Issues 1â2, 30 August 2007, Pages 124-130
نویسندگان
Hyung-Il Kim, Geon-Hoo Jeon, Sang-Joon Yi, Yong Hoon Kwon, Hyo-Joung Seol,