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ingots of high purity tin metalMetal & Alloy Services

Arc casting of intermetallics may sound mundane, however, depending on the solidification behavior of the constituents inhomgenety, defects, and other phyical pheonmena may result. Below is an example of solidification segregation that generates stress in a casting.
  Solidification of LaNi5-xSnx in an plasma/arc furnace
 

The modified AB5 alloy is used for hydrogen storage. Upon solidification the Sn is partially rejected and increases in concentration in the remaining liquid. Upon completing solidification there is a great deal of internal stress in the ingot. As the ingot cools further the stress is relieved.

View the video (AVI, 2 MB)



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