Accession Number : AD0608991

Title :   CALORIMETRY OF TRANSIENT PHENOMENA IN METALS AT LOW TEMPERATURES,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : Erdmann,Joachim C. ; Jahoda,James A.

Report Date : OCT 1964

Pagination or Media Count : 47

Abstract : A method is described which has been applied to measure the thermal energy leaving a metal specimen at low temperatures under the following conditions of thermal excitation: 1) Generation of localized instantaneous heat sources associated with discontinuous slip during tensile deformation of copper-nickel alloy specimens at 4.2K. 2) Uniform heating of copper-nickel and lead-indium alloy specimens at time-dependent rates due to pre-plastic and plastic tensile deformation at 4.2K. The method is based on the observation of thermal transients associated with the heat release. The inertia of the thermometers is either eliminated or accounted for. The results obtained permit a discussion of (a) the stored energy of plastic deformation of metals, (b) the energy dissipated by the bowing and breakaway of dislocations pinned by solute atoms in solid solutions. (Author)

Descriptors :   (*CRYOGENICS, ALLOYS), (*ALLOYS, CRYOGENICS), (*METALS, CRYOGENICS), METALS, COPPER ALLOYS, NICKEL ALLOYS, LEAD ALLOYS, INDIUM ALLOYS, CALORIMETERS, DEFORMATION, CRYSTAL DEFECTS, THERMAL PROPERTIES, SOLID SOLUTIONS, HEAT TRANSFER, TRANSPORT PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE