The Effect of Age Hardening on Microstructures and Mechanical Properties of 93.7Ag-6.0Cu-0.3Sn Alloy

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Siriporn Rojananan
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Surasit Rojananan
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Kraingkrai Sangaumnatdej
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Suriyong Changnin
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Anake Panwawwow
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Abstract

The objective of this work is to study the effect of aging hardening on microstructures and mechanicalproperties of 93.7Ag-6.0Cu-0.3Sn alloy. Alloy was prepared from high purity Ag, Cu and Sn bymelting. Subsequently, samples were cold rolled. Age hardening was performed by solution treatment attemperatures in the range of 720-760 oC and aging at temperatures in the range of 260-320 oC. Mechanicalproperties and microstructures were investigated. The results showed that the hardness of the as-castsample was 73 HV. The as-cast microstructure consisted of Ag rich dendrite and eutectic structure. Thehardness and tensile strength of sample after aging depend on both the aging time and temperature. Itcould be concluded that hardness, tensile strength and elongation were maximized by solution treatment at740 oC and subsequently aging at 300 oC, which exhibited the hardness of 167 HV, the tensile strength of415 MPa, and the elongation of 9.2%.

Keywords : Age Hardening / Silver Alloy / Cold Rolling / Silver Sterling

Article Details

Issue
Vol. 31 No. 2 (2008): April - June
Section
Original Articles
Author Biographies

Siriporn Rojananan, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Lecturer, Division of Materials Technology, School of Energy, Environment and Materials.

Surasit Rojananan, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Lecturer, Department of Tool and Materials Engineering, Faculty of Engineering.

Kraingkrai Sangaumnatdej, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Undergraduate Students, Department of Tool and Materials Engineering, Faculty of Engineering.

Suriyong Changnin, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Undergraduate Students, Department of Tool and Materials Engineering, Faculty of Engineering.

Anake Panwawwow, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Undergraduate Students, Department of Tool and Materials Engineering, Faculty of Engineering.