✍ Scribed by W. Philipp
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Cu. wt. 96 FIG. 2. Effect of composition of Al(&) alloys on hardness drop after 20 per cent strain and aging at 2OO'C (after Gane and Parkins). of aging of Al(Cu) at 200°C following solution treatment and cold work. Since the specimens were quite massive, quenching produced no vacancy supersaturation, but cold work after quenching achieved the same result. A selection of the results of these authors is reproduced in Fig. 2. It is now assumed that those alloys containing in excess of 2-3 wt.% Cu retain the maximum possible concentration of vacancies introduced during cold working, while the vacancies introduced into the more dilute alloys would be unstable and substantially anneal out during and immediately following cold work.
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In TiO on the other hand, where the ionicity is \*
the behavior of TiN and TiO&, alloys in various mineral acids. In a recent paper by Phillip, experimental results obtained from the anodic dissolution of TiN in aqueous perchloric acid were interpreted by him as constituting support for metallic bonding in TiN. Although Pearson 12) has pointed out