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Ti3Al 합금에 있어서 변형쌍정의 출현에 관한 실험적 고찰
이종욱,화전수치 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.5
Experimental approaches to a mechanism of deformation twinning in Ti₃Al alloys of the hexagonally ordered DO_(19) structure deformed in compression in the temperature range of 973K to 1373K and room temperature are examined focusing on relative intensity (long range order degree), non-a dislocation, the size of APD and the width of APB. The relative intensity ratio(I_(○)/I_(○)) measured by X-ray diffraction decreases with increasing temperature in the range of 973K to 1373K, indicating that the incidence of deformation twinning results from the decrease of long-range order degree. Moreover, non-c dislocations are visible in Ti-34㏖% Al alloy deformed at room temperature after water quenched from 1273K. The width of APBs in Ti-34mol% Al alloy compressed at 1273K is wider than that in Ti-34㏖% Al alloy compressed at room temperature. The size of APD in Ti-34㏖% Al alloy after annealed at 1273K is much smaller than those in Ti-30㏖% Al and Ti-25㏖% Al allovs.
Powder Fabrication of Nb-Ti Alloys Using Hydrogenation Process
Semboshi Satoshi,Masahashi Naoya,Konno Toyohiko J.,Hanada Shuji 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Nb-Ti alloys were hydrogenated to prepare fine and contamination-free powders. Cracks were introduced in the alloys when they were annealed at 1473 K and cooled in a hydrogen atmosphere. The fragments produced by hydrogen-induced cracking are brittle and the friability enhanced with the Ti content of the alloy, which is beneficial for further refinement of particle size. We also demonstrate that Nb-Ti powders with the average particle size less than 1 m can be produced by ball milling at a temperature lower than 203 K. Furthermore, hydrogen-free powders can then be obtained by annealing above the temperature corresponding to hydrogen desorption from Nb solid solution.
비화학양론조성을 갖는 Ti3Al 합금에 관한 슬립과 변형쌍정
이종욱,김일봉,박영구,이광로,화전수치 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.5
Compression tests for a single crystalline and polycrystalline Ti₃Al alloys of the hexagonally ordered DO_(19) structure deformed in compression were carried out to determine a temperature range in which deformation twinning is induced. Deformation twinning does not occur in a single crystalline Ti₃Al alloys. Prism plane slips are activated when single crystalline Ti₃Al alloys are compressed in the vicinity of the a axis. On the other hand, pyramidal and basal plane slips are activated when single crystalline Ti₃Al alloys are compressed in the vicinity of the c axis. In a polycrystalline Ti₃Al alloys, deformation twinning does occur in the temperature range of 1073K to 1373K only in Ti-34㏖%Al alloy. Dominant deformation twinning system is identified as [101 ̄1] (1012 ̄) in the temperature range of 1073K to 1373K. The volume fraction of deformation twins increases with increasing temperature in the temperature range of 1073K to 1273K. With further increasing temperature, however, the volume fraction of deformation twins decreases. The volume fraction of deformation twins increases with increasing total strain at 1173K and 1273K. Non-a dislocations and APBs in Ti-34㏖%Al alloy are visible in the temperature range induced deformation twinning.
Microstructure and properties of cross-roll rolled and heat treated metastable TiNbSn alloy.
Jung, Taek-Kyun,Choi, Ho-Joon,Kim, Kyung-Taek,Shin, Young-Chul,Lee, Hyo-Soo,Lim, Sung-Chul,Kwon, Hyouk-Chon,Hanada, Shuji American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.10
<P>A (Ti-35mass%Nb)-4mass%Sn alloy was cross-roll rolled with a reduction ratio of 70% in which the roll axes are tilted by 5 degrees away from the transverse direction of the rolled sample and then aged at 250 degrees C for 2 h. Cross-roll rolling was found to increase yield strength and Young's modulus, simultaneously. Yield strength was higher in cross-roll rolled than in conventionally rolled at same reduction ratio. Yield and tensile strength further increased by a low temperature ageing by ψ precipitation hardening and microstructure refinement. Yield and tensile strength of the aged 70% cross-roll rolled sample were higher than those of the aged 70% conventionally rolled one.</P>