Document Type

Report

Publication Date

4-1960

Abstract

An initial study was conducted on the effects of cyclic temperature variations of small amplitudes upon the creep properties of tantalum. The results show a marked weakening of the material when a temperature variation of a few degrees is applied in a sinusoidal manner at a rate of one cycle per hour.

Application of a temperature compensated time parameter for the prediction of the cyclic temperature curves is inadequate to explain the observed increase in creep rate. With vacuum arc-cast tantalum, possessing high initial cold work, relief of the residual cold work strain appears to contribute to the acceleration of the strain rate as evidenced by a reduction in hardness after the cyclic temperature application. Sintered tantalum showed a similar acceleration of the creep rate under cyclic temperatures without a change in hardness . Experimental results indicate that an optimum temperature condition may exist for plastic deformation to occur under cyclic temperatures.

Report Number

IS-125

Language

en

File Format

application/pdf

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