科研之友
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摘要
Despite Au, Al and Cu being individually very well-known elements, their ternary phase diagram has not been studied in as much detail as those of many other Au-containing ternaries. Here we review what is known, and consider the prospects for technological exploitation of some of the ternary compositions. The components of greatest interest in Al-Au-Cu may be the P-phases, at least two of which have shape memory properties. Of these, 'Spangold', which has the nominal stoichiometry Au(7)Cu(5)Al(4), has received some attention for jewellery applications, while the edge compound Cu(3)Al is a well-known shape memory composition with corresponding specialised industrial uses. The properties of other beta-phase compositions in the system have been scarcely investigated. The system also contains an extensive gamma-phase, Al(4)Au(x)Cu(9-x), where x ranges from 0 to similar to 6.5, and the purple gold phase AuAl(2).
- 出版日期2009
