Browsing by Author "Hacking, R. G."

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    A simple technique for the preparation of thin foils in aluminium and its alloys
    (College of Aeronautics, 1967) Hacking, R. G.
    Transmission electronmicroscopy using thin metal foils depends largely upon the success of the techniques used for the preparation of the thin foil. Many methods have been developed successfully for a wide range of materials and these have been discussed in detail elsewhere. These methods are as diverse as mechanical polishing, ionic bombardment and electrochemical thinning. The basis of one of the simplest of these methods is to produce a small sample of the metal and to thin this by a combination of mechanical polishing and electrolytic dissolution … [cont.].
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    Some microstructural features of fatigue in an aluminium alloy
    (College of Aeronautics, 1969-01) Hockenhull, B. S.; Panakal, J. D.; Hacking, R. G.
    The microstructures produced by the heat treatment of a commercial age hardening At-4.4 Cu alloy have been examined by thin foil electron microscopy. Whilst there is similarity of the microstructures in the commercial alloy to those which have been reported for simple binary At-Cu alloys, there is a strong association of dislocation structures and incoherent precipitates with undissolved Mn bearing intermetallic particles. Fatigue tests made on the alloy at both 50 Hz and 20 kHz have shown that there are changes in microstructure during fatigue; more markedly at 20 kHz in which tests the heating effect has some importance. There is some evidence of both accelerated ageing and also the by-passing or resolution of coherent phases during fatigue, particular at 20 kHz.