PURPOSE:To obtain a shape memory alloy of high performance at a low cost without damaging its high temp. working function, in a Ti-Pd shape memory alloy, by substituting a part of Pd by W, Ta or the like. CONSTITUTION:As a Ti-Pd shape memory alloy having high temp. working capacity, in an alloy having a compsn. constituted of, by atom, 45.0 to 51.0% Pd and the balance Ti, a part of expensive Pd is substituted by either W or Ta or by both in the ratio of total 1.0 to 25 atomic %. Or, it is a Ti-Pd-X alloy (where X denotes the above V, Cr, Mn, Ni, Fe, Co and Cu) in which a part of Pd in the Ti-Pd shape memory alloy having the above compsn. is substituted by one or more kinds among V, Cr, Mn, Ni, Co and Cu or is an inexpensive shape memory alloy in which a part of Pd is moreover substituted by metals having high atomic weight such as W and Ta.
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