Ghosh, M and Kar, Abhijit and Das, Swapan K and Ray, Ajoy K (2009) Aging Characteristics of Sn-Ag Eutectic Solder Alloy with the Addition of Cu, In, and Mn. Metallurgical and Materials Transactions A, 40A . pp. 2369-2376.
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In the present investigation, three types of solder alloy, i.e., Sn-Ag-Cu, Sn-Ag-In, and Sn-Ag-Cu-Mn, have been prepared and joined with Cu substrate. In the reflowed condition, the joint interface is decorated with Cu6Sn5 intermetallic in all cases. During aging at 100 C for 50 to 200 hours, Cu3Sn formation took place in the diffusion zone of the Sn-Ag-Cu and Sn-Ag-In vs Cu assembly, which was not observed for the Sn-Ag-Cu-Mn vs Cu joint. Aging also leads to enhancement in the width of reaction layers; however, the growth is sluggish (~134 KJ/mol) for the Sn-Ag-Cu-Mn vs Cu transition joint. In the reflowed condition, the highest shear strength is obtained for the Sn-Ag-Cu-Mn vs Cu joint. Increment in aging time results in decrement in shear strength of the assemblies; yet small reduction is observed for the Sn-Ag-Cu-Mn vs Cu joint. The presence of Mn in the solder alloy is responsible for the difference in microstructure of the Sn-Ag-Cu-Mn solder alloy vs Cu assembly in the reflowed condition, which in turn influences the microstructure of the same after aging with respect to others.
|Uncontrolled Keywords:||Solder alloy, aging|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr Mainak Ghosh|
|Deposited On:||13 Aug 2011 18:33|
|Last Modified:||29 Nov 2011 13:42|
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