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Ti-35Ni-15Cu (at%) 합금의 B2=B19 변태에 수반되는 형상기억특성
천병선,남태현,홍석균,허경철 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.7
Shape Memory Characteristics associated with the B2⇔B19 transformation in a Ti-35Ni-15Cu(at%) alloy have been investigated by means of thermal cycling test under constant load and optical microscopy. The B2→B19 transformation start temperature under load, M´_s(ℓ) increased linearly with increasing applied stress up to about 100MPa, above which a deviation from the linearity occured. Considerably large residual elongation started to occur at about 100MPa and thus, the maximum recoverable transformation elongation associated with the B2→B19 transformation was found to be 2.9%. Preferentially oriented martensite variants in relation to the applied stress was more stable on heating than the variants which formed a triangular shape.
TiNI 형상기억합금의 열처리에 의한 경도 및 내마멸특성
천병선,남태현 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.6
The hardness of TiNi alloys containing Ni from 50 at.% to 53 at.% was measured. Wear test was performed by rubbing these alloys against SUS316 or S45C. The results obtained are as follows; 1) Microvickers hardness in low load from 10gf to 100gf was very high. This is thought to be caused by the rubber elastic effect, the martensitic characteristic of these alloys. 2) The quenched Ni-Ti alloy contained Ni above 51 at.%. The hardness of these alloys in the liquid nitrogen temperature were less than in room temperature. This is thought to be due to the two reasons; one is that Ms point is below the room temperature and martensitic transformation is induced by indenter during the hardness testing, the other is the intrinsic rubber elasticity of martensite. 3) SUS316 was adhered to Ni-Ti alloy and the weight of Ni-Ti alloy was increased by 3㎎. It is thought that this is due to the high work hardenability of TiNi alloy in -196℃.
Ti-35Ni-15Cu (at%) 형상기억합금의 B2 B19 B19' 변태거동
천병선,남태현,임승택 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.2
Transformation behaviour of a Ti-35Ni-15Cu(at%) shape memory alloy has been investigated by means of electrical resistivity measurement, differential scanning calorimetry, X-ray diffraction and transmission electron microscopy. Transformation occurred in two stages, i.e., B2◎B19◎B19' and the B19→B19' transformation was not complete even at 83K. The B19◎B19' transformation was not clear in DSC curves, while it was clear in the electrical resistivity vs. temperature curve. The B19 martensite did not involve internal defects such as dislocation and twin. This corresponded well to the fact that the lattice distortion associated with the B2→B19 transformation satisfied the invariant plane strain condition