LIGHTWEIGHT PRECIOUS ALLOY MADE FROM TITANIUM AND GOLD, AND TIMEPIECE OR JEWELLERY ITEM COMPONENT MADE FROM A LIGHTWEIGHT PRECIOUS ALLOY OF TITANIUM AND GOLD

摘要

A lightweight precious alloy made from titanium and gold, comprising at least 750‰ by weight of gold, characterised in that said alloy has a composition of formula: Ti_a Au_b M_c T_d in which a, b, c, d are atomic proportions and such that: a+b+c+d=1, 0.45≤a≤0.55; 0.41≤b≤0.495; 0.025≤c≤0.13; 0.001≤d≤0.025, in which M represents one or several elements chosen from a first group comprising (Nb, V, Pd, Pt, Fe), in which T represents a maximum of two elements chosen from a second group comprising Nb, V, Pd, Pt, Fe, Mo, Ta, W, Co, Ni, Ru, Rh, Ir, Cr, Mn, Cu, Zn, Ag, Al, B, Si, Ge, Sn, Sb and In, excluding said metals M comprise said alloy. A component for a timepiece, jewellery item or item of personal adornment made from such a lightweight precious alloy made from titanium and gold.