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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.
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.