| Title |
Experimental Approaches for Appearance of Deformation Twinning in Ti3Al Alloys |
| Authors |
이종욱(Jong Wook Lee) ; 화전수치(Shuji Hanada) |
| Abstract |
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. |