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다결정질 Fe-Mn-Si계 형상기억합금의 형상기억능과 변태점에 미치는 결정입도와 이전가공의 영향
최종술,김현우,진원,손인진,백승한 ( Chong Sool Choi,Hyun Woo Kim,Won Jin,In Jin Shon,Seung Han Baek ) 한국열처리공학회 1990 熱處理工學會誌 Vol.3 No.1
Effects of grain size and cold rolling degree on shape memory ability and transformation temperature were studied in Fe-35% Mn-6% Si shape memory alloy. Md point of the alloy was determined by variation of yield stress with test temperature. The Md point measured in this way was linearly increased with increasing grain size. Shape memory ability of the alloy was decreased with increasing grain size, showing a minimum value at around 63㎛, and then increased with increasing grain size. From this result, it was concluded that the shape memory ability in the grain size smaller than a critical value is controlled by amount of retained γ and prior ε phase, but that the shape memory ability in the grain size greater than the critical value is mainly dominated by grain boundary area in unit volume of parent phase. The shape memory ability was decreased with increasing deformation degree. This was because the γ content being available for the formation of ε martensite during bending was decreased with increasing deformation degree.
Fe-Mn 합금의 γ↔ε마르텐사이트변태에 필요한 구동력
이영국,최종술 ( Young Kook Lee,Chong Sool Choi ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.4
Dilatometric experiment and thermodynamic calculation have been performed to determine M_s, A_s and driving forces for γ→ε martensitic transformation of Fe-Mn alloys. The transformation temperatures(M_s, A_s, T_o) were decreased with increasing manganese content and were newly formulated as a function of manganese content. Driving force for γ→ε martensitic transformation was increased from -75J/mole to -105J/mole with increasing manganese content from 15wt.% to 25wt.%. Transformation temperature hysteresis(A_s-M_s) was also increased from 50K to 80K with increasing mangenese content from 15wt.% to 25wt.%. The small driving force(-75J/mole-105J/mole) and small ΔT(50K∼80K) for γ→ε martensitic transformation indicated that Fe-Mn alloys behave like thermoelastic martensitic alloys : We would like to call them semi-thermoelastic martensitic alloys.