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Fe-30%Mn-6% Si 합금의 형상기억효과에 미치는 Training(SIM↔γ)의 영향
한상호,전중환,최종술 ( Sang Ho Han,Joong Hwan Jun,Chong Sool Choi ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.2
Five alloys were selected randomly in the composition range showing the best shape memory effect in Fe-Mn-Si system reported by Murakami. The shape memory effects of those alloys were mainly investigated through the training treatment which consisted of the repetition of 2% tensile deformation at room temperature and subsequent annealing at 600℃ above A_f temperature. At the same deformation degress in rolling 600℃-annealing for 1hr. showed the best shape memory effect, and 10% deformation degrees represented maxima of the shpae memory effects at all annealing temperatures, 500℃, 600℃ and 700℃. The shape memory effects of the alloys were increased by increasing training cylcle up to 5 cycles. This was because a large number of dislocations introduced by training process gave rise to increase in the austenite yield stress, and acted as nucleation sites for stress induced s martensite. The thermal cycling treatment, repetition of cooling in nitrogen at -196℃ and heating to 300℃ for 5 min., did not improve the shape memory effect.