Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 7 No. 1 (1966) pp.15-22
© 1966 The Japan Institute of Metals

Alloy Hardening in Alpha Cu-Al Single Crystals at Low Temperatures

Koji Kamada*

Load-elongation curves of single crystals of Cu-Al solid solutions of 1.2, 2.3, 6.5, 10.5 and 14.2 at% aluminum are measured at room temperature, the liquid nitrogen temperature and the liquid helium temperature. Serrations are observed in the load-elongation curves in the stages I and II. The increase of yield stress on annealing at 200°C and the dependence of yield stress and yield drop on the crystallographic orientation of the tensile axis are also observed. From these experimental results, the hardening of Cu-Al solid solutions is concluded to be due to a source hardening mechanism. The ``pole mechanism'' for glide dislocations is considered as the origin of the serrations in the stage I. Annealing effects on several work-hardening parameters are also observed.

(Received August 17, 1965)

* Japan Atomic Energy Research Institute Tokaimura, Ibaraki-ken, Japan.

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