Timepiece component with a shaft-like portion made of non-magnetic alloy

A timepiece component comprising:

• a shaft portion including at least one pivot about a pivot axis,
• wherein at least a material forming said shaft portion is a non-magnetic alloy containing at least silver and palladium and having a Vickers hardness of more than 450 HV,
• wherein said shaft portion carries at least one added element which is non-magnetic,
• wherein said timepiece component is a balance, and the at least one added element is a rim and at least one plate, each of the rim and at least one plate is supported on respective bearing surfaces,
• wherein the rim is spaced apart from the plate along a longitudinal axis of the shaft,
• wherein a material forming each of the rim and the plate is a non-magnetic alloy containing at least silver and palladium,
• wherein the material forming the shaft portion has a coefficient of expansion between 14×10−6 and 17×10−6,
• wherein the material forming said shaft portion is a non-magnetic ternary alloy of silver, palladium and copper, wherein said non-magnetic ternary alloy contains, by mass, 36% to 40% palladium, 38% to 42% silver and 19% to 23% copper, the total by mass of silver, palladium and copper being less than or equal to 100%,
• wherein the material forming said shaft portion has a Vickers hardness of between 450 HV and 510 HV, and
• wherein the material forming said shaft portion has a Poisson's ratio of between 0.35 and 0.39.