Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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The Role of Boron on Grain Refinement in Sterling Silver Alloy

Siriwan Sakultanchareonchaia, Natthaphol Chomsaengb, Meechai Thepnaratb, Hiroki Kuratac, Seiji Isoda
* Author for corresponding; e-mail address: tchairuangsri@gmail.com
Volume: Vol.39 No.2 (APRIL 2012)
Research Article
DOI:
Received: 27 October 2011, Revised: -, Accepted: 16 March 2012, Published: -

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.

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.

Keywords: Grain Refinement, Sterling Silver, Boron, TEM

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Performance of Giant Freshwater Prawn (Macrobrachium rosenbergii de Man) Reared in Earthen Ponds Beneath Plastic Film Shelters
page: 89 - 96

Niwooti Whangchai, Thepparath Ungsethaphand, Chanagun Chitmanat, Kriangsak Mengumphan and Supattra

Vol.34 No.1 (JANUARY 2007)
Research Article View: 870 Download: 427
Preparation of Nanosilica Powder from Rice Husk Ash by Precipitation Method
page: 206 - 211

Nittaya Thuadaij and Apinon Nuntiya

Vol.35 No.1 (JANUARY 2008)
Research Article View: 2,027 Download: 447
A New Analytical Expression of the Gas Conversion for TAP Experiments with Bimodal-Pore-Structure Catalyst
page: 150 - 155

Wisuthchai Boonwatcharapunsakul and Phungphai Phanawadee

Vol.35 No.1 (JANUARY 2008)
Research Article View: 860 Download: 348
Pressure-Temperature Estimates of the Metamorphosed Sedimentary Rocks on the Eastern Side of Khao Phai, Immediate West of Ban Choeng Chai, Wang Pong, Phetchabun Province, Thailand
page: 283 - 293

Yuenyong Panjasawatwong, Boontarika Srithai and Udomporn Wipakul

Vol.35 No.2 (MAY 2008)
Research Article View: 903 Download: 257
Artificial Neural Networks Parameters Optimization with Design of Experiments: An Application in Ferromagnetic Materials Modeling
page: 83 - 91

Wimalin Laosiritaworn, and Nantakarn Chotchaithanakorn

Vol.36 No.1 (JANUARY 2009)
Research Article View: 910 Download: 363
Effect of Addition of CuO and Bi2O3 on Low Temperature Sintering of Pb(Zr,Ti)O3 - PbZn1/3Nb2/3O3- Pb(Ni1/3Nb2/3)O3 Based Ceramics
page: 50 - 58

Athipong Ngamjarurojana

Vol.36 No.1 (JANUARY 2009)
Research Article View: 935 Download: 321
Solving First Order Systems of Ordinary Differential Equations Using Parallel R-Point Block Method of Variable Step Size and Order
page: 9 - 23

Zurni B. Omar, and Mohamed Suleiman

Vol.36 No.1 (JANUARY 2009)
Research Article View: 836 Download: 248
Developing Indicators for Floodplain Wetlands: Managing Water in Agricultural Landscapes
page: 224 - 235

Kim Jenkins, Richard Kingsford, and Darren Ryder

Vol.36 No.2 (MAY 2009)
Short Communication View: 910 Download: 375
New Positive Temperature Coefficient Effect Based on Bi2O3+Fe2O3 or ZrO2+MnO2 Material and Used as Temperature Sensor
page: 109 - 120

Thongchai Panmatarith* [a], Chiraporn Sriprom [a] and Nanthida Sutthirawuth [b]

Vol.32 No.2 (MAY 2005)
Research Article View: 869 Download: 415
Synthesis and Characterisation of Poly(2-hydroxyethyl methacrylate-co-methyl acrylate) Hydrogels for Use as Temporary Skin Substitutes
page: 71 - 82

Tiwaporn Siriwittayakorn [a], Nantarat Suebsanit [a], Robert Molloy [a], Paisit Siriwittayakorn [b] and Malinee Prasitsilp [c]

Vol.28 No.2 (DECEMBER 2001)
Opinion View: 904 Download: 286
Rough Classifier: Experiments on Two Medical Data Sets
page: 59 - 63

Azuraliza A. Bakar, Md N. Sulaiman, Mohamed Othman and Mohd H. Selamat

Vol.28 No.1 (JUNE 2001)
Opinion View: 867 Download: 222
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

Torranin Chairuangsri [a], Rik M. D. Brydson [b], David V. Edmonds [b]

Vol.28 No.1 (JUNE 2001)
Opinion View: 1,061 Download: 816
Solving First Order Systems of Ordinary Differential Equations Using Parallel R-Point Block Method of Variable Step Size and Order
page: 1 - 13

Zurni B. Omar, and Mohamed Suleiman

Vol.37 No.1 (JANUARY 2010)
Research Article View: 826 Download: 270
Effects of Beryllium on Microstructure and Resiliency of Silver-Copper Alloy
page: 260 - 268

Torranin Chairuangsri, and Ekasit Nisaratanaporn

Vol.37 No.2 (MAY 2010)
Research Article View: 990 Download: 293
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