Energy Relations in Cold Working an Alloy at 78°K and at Room Temperature

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Abstract
The energy relations associated with the plastic deformation by cold working of a 75 percent gold—25 percent silver alloy at two temperatures were investigated. The samples were produced by drilling under controlled conditions, which is a suitable method of deformation. The energy stored in the chips was measured by tin solution calorimetry and the total energy expended in the deformation was determined from dynamometer measurements. The results for cutting with a drill having the most suitable geometry were as follows. The energy stored at room temperature was 0.50 cal/g and the corresponding value for 78°K was 1.48 cal/g. The values of the total energy of deformation were 53.5 cal/g at room temperature and 109 cal/g at 78°K. The true stress‐true strain curve at room temperature was normal for a nonferrous metal and the curve for 78°K showed the behavior expected at low temperature from a face‐centered cubic metal.