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TiAl 계 금속간화합물에서 Mn 첨가가 상온연성에 미치는 효과
정인상,조현국 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.10
TiAl intermetallic compounds are regarded as one of the most feasible future elevated temperature structural materials, because of their high elevated temperature strength and oxidation resistance. However, it has been pointed out that they are difficult to fabricate due to their poor ductility at room temperature, which restricts their applications. In this study, attempts to improve the room temperature ductility of TiAl intermetallic compounds were made via the addition of Mn and designing heat treatments, which can refine grain size, shorten slip length and control microstructure and phase constitution. Maximum strain was obstained at the composition of Ti-47.6Al-2.7Mn(at.%) heat created at 1623 K for 30 hours. This can be rationalized by the fact that the addition of Mn tends to lower volume fraction of α₂, promote formation of γ phase containing twins, change axial ratio (c/a), refine grain size and shape lamellar morphology. Peak hardness value was obtained with the heat treatment at 1623 K for 30 hours. This increased hardness might be explained in terms of the increased volume of the α₂ phase and decreasing grain size by the addition of Mn.
NiAl 계 형상기억합금의 미세조직과 연성에 미치는 Fe, Mn 첨가의 영향
정인상,최창수 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.2
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㎚.
2 차 재결정에 의한 몰리브덴 단결정화에 미치는 제 인자의 영향
정인상,박권희,유봉선 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.10
The effect of dopants, rolling amount, annealing temperature and texture on the production of molybdenum single crystals by secondary recrystallization was investigated systematically. Secondary recrystallization of every doped specimen occurred at a temperature higher than 2100℃ In the case of the specimen doped with Ca(OH)₂, single crystals were made at the lowest temperature of 2100℃ In the specimens doped with Mg(OH)₂ and MgO rolled to 95%, however, single crystals were not made when annealed at 2100℃ and 2200℃ , respectively. The orientation of textures of rolling and primary recrystallization was {100}(hkl). The orientation of the single crystal deviated from {100}$lt;hkl$gt; by 1020°.