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Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University
 


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The Role of Boron on Grain Refinement in Sterling Silver Alloy


Paper Type 
Contributed Paper
Title 
The Role of Boron on Grain Refinement in Sterling Silver Alloy
Author 
Siriwan Sakultanchareonchaia, Natthaphol Chomsaengb, Meechai Thepnaratb, Hiroki Kuratac, Seiji Isoda
Email 
tchairuangsri@gmail.com
Abstract:

The role of boron on grain refinement in the Sterling silver alloys grade 950 containing 3.9%Cu, 0.08%Si, 0.11%Sn and 1%Zn without and with boron addition was studied. Microstructure of the silver alloys was investigated by light microscopy, electron probe microanalysis, scanning and transmission electron microscopy. To study microstructural phenomena at grain boundaries, thin foils for transmission electron microscopy were prepared by focused ion beam method, cross-sectional along the grain boundaries. The results revealed that addition of boron at less than 10 ppm level into the alloy reduced the grain size by a factor of about three. Nano-scale copper-rich particles were found at grain boundary vicinity in the silver alloy with boron addition. Enhancement of segregation ability of copper and a possibility of co-segregation of boron and carbon with copper to grain boundaries leading to precipitation of fine particles were therefore proposed. This supports the constitutionally-undercooled-zone mechanism of grain refinement.

Start & End Page 
242 - 253
Received Date 
2011-10-27
Revised Date 
Accepted Date 
2012-03-16
Full Text 
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Keyword 
Grain Refinement, Sterling Silver, Boron, TEM
Volume 
Vol.39 No.2 (APRIL 2012)
DOI 
Citation 
Sakultanchareonchaia S., Chomsaengb N., Thepnaratb M., Kuratac H. and Isoda S., The Role of Boron on Grain Refinement in Sterling Silver Alloy, Chiang Mai Journal of Science, 2012; 39(2): 242-253.
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Author:Tiwaporn Siriwittayakorn [a], Nantarat Suebsanit [a], Robert Molloy [a], Paisit Siriwittayakorn [b] and Malinee Prasitsilp [c]
Vol.28 No.2 (DECEMBER 2001) View: 700 Download:233
Rough Classifier: Experiments on Two Medical Data Sets
page: 59 - 63
Author:Azuraliza A. Bakar, Md N. Sulaiman, Mohamed Othman and Mohd H. Selamat
Vol.28 No.1 (JUNE 2001) View: 674 Download:165
Determination of Number Density and Volume Fraction of Copper Precipitates Within Proeutectoid Cementite in High-Carbon Copper-Containing Steels Using Transmission Electron Microscopy
page: 31 - 38
Author:Torranin Chairuangsri [a], Rik M. D. Brydson [b], David V. Edmonds [b]
Vol.28 No.1 (JUNE 2001) View: 787 Download:239
Solving First Order Systems of Ordinary Differential Equations Using Parallel R-Point Block Method of Variable Step Size and Order
page: 1 - 13
Author:Zurni B. Omar, and Mohamed Suleiman
Vol.37 No.1 (JANUARY 2010) View: 648 Download:219
Effects of Beryllium on Microstructure and Resiliency of Silver-Copper Alloy
page: 260 - 268
Author:Torranin Chairuangsri, and Ekasit Nisaratanaporn
Vol.37 No.2 (MAY 2010) View: 715 Download:239



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