Structural evolution during crystallization in phase separated Ti–Y–Al–Co metallic glass |
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Authors: | Byung Joo Park Sung Woo Sohn Won Tae Kim Do Hyang Kim |
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Affiliation: | aDepartment of Metallurgical Engineering, Center for Noncrystalline Materials, Yonsei University, Seoul 120-749, Republic of Korea;bApplied Science Division, Cheongju University, Cheongju 360-764, Republic of Korea |
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Abstract: | Structural evolution during heat treatment of melt spun Ti36Y20Al24Co20 alloy was studied using differential scanning calorimetry, X-ray diffractometry and transmission electron microscopy. The as-melt spun Ti36Y20Al24Co20 specimen showed a hierarchical complex microstructure consisting of Ti-rich and Y-rich amorphous phases and crystallized with two-step process. Crystallization in the phase separated two phase mixture took place in a confined mode due to different thermal stability and complex microstructure, resulting in various nano-scaled microstructural formation ranging from fine distribution of crystalline particles in amorphous matrix to fine distribution of amorphous particles in crystalline matrix. |
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Keywords: | Metallic glasses Amorphization Phase transitions |
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