발간논문

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Vol.37, No.2, 170 ~ 178, 1999
Title
Research Paper / Mechanical Behavior : Effects of Fe , Mn alloying on Microstructure and Ductility of the NiAl Base Shape Memory Alloys
최창수Chang Soo Choi, 정인상In Sang Chung
Abstract
The purposes of this study are to clarify effects of Fe. Mn alloying on microstructure and ductility of the NiAl base shape memory alloys. It has been found that the γ phase formed by the alloying Fe or Fe+Mn has a drastic effect not only on the hot workability but also on the tensile ductility at room temperature. The enhancement in ductility is mainly due to presence of the γ phase with a high ductility and grain refinement of the β phase by the adjacent γ phase for annealing. The specimens quenched from 1300℃ consisted of the β′(L1_0) and r(disorded fcc). The β′ martenste have a {111} $lt;112$gt; internal twins. The c/a value of the β′ phase is 0.86-0.87, almost equal to that of the binary Ni-Al β′ phase. And the lattice parameter of the γ phase is 0.358-0.359㎚.
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