A method of studying the effect of strain on the internal friction of small metal single crystals

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Abstract
For internal friction measurements thin rectangular sheets of molybdenum were mounted as vibrating cantilevers, the vibrations being excited and detected electrostatically. A method has been developed to enable a specimen to be pulled in a standard tensile machine without demounting it from the measuring clamp. This involves gripping the lower end of the specimen by solidification of a eutectic alloy. A high-vacuum cell was developed which enabled the internal friction to be measured from 80-530K. The electrode-sampled spacings could be accurately adjusted from outside the cell, so that measurements could be made at the same vibration amplitude after re-mounting the strained sample.

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