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oa Precious Palladium-Aluminium-Based Alloys with High Hardness and Workability
PROMISING POTENTIAL FOR APPLICATION IN JEWELLERY AND WATCHMAKING
- Source: Platinum Metals Review, Volume 53, Issue 4, Oct 2009, p. 189 - 197
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- 01 Jan 2009
Abstract
New palladium-aluminium-based alloys with promising potential for application in the areas of jewellery and watchmaking are presented. Aparticular emphasis is placed on the mechanical behaviour of ternary palladium-aluminium-ruthenium (PdAlRu) alloys with 95 wt.% Pd. The new alloys combine high plasticity with high hardness relative to common Pd alloys. The low work-hardening rate enables cold working in excess of 95% reduction without intermediate annealing. The hardness (Vickers pyramid indentation) ranges from 100 HV to 300 HV in the annealed condition, depending on the Al:Ru ratio. Their whiteness in terms of colour coordinates is compared with platinum and white gold. The feasibility of porcelain fusion to PdAlRu for decorative purposes is also demonstrated.