Superelasticity of Ti-16 at%Nb-4.8 at%Sn alloy consisting of non-(or minimal-) cytotoxic elements was investigated for biomedical applications as functions of deformation temperature and aging heat treatment after quenching. As-quenched Ti-16Nb-4.8Sn having A f (the reverse martensitic transformation finish temperature) of 266 K exhibits superelasticity at human body temperature (310 K) with an elastic recovery strain of 3.2%. A f decreases with increasing aging temperature in the range of 353 to 423 K or with increasing aging time at 423 K. It is confirmed from TEM observation and Young's modulus measurements that ! transformation occurs on aging at 423 K for 500 h. Stress for inducing martensitic transformation, M , increases with aging. Stress-strain curves showing superelasticity are quite similar to each other when as-quenched or aged samples are deformed at such temperatures that they have the same M . It is concluded that maximum superelastic recovery strain can be obtained at intended temperature, e.g. human body temperature, in Ti-Nb-Sn alloys by aging at relatively low temperatures.
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