Microstructural Evolution During Superplastic Deformation in Large-Grained Single Phase Ni-48Al Intermetallics

Acta Metall Sin

2004, Vol. 40

Issue (5): 489-493 DOI:

Research Articles

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Microstructural Evolution During Superplastic Deformation in Large-Grained Single Phase Ni-48Al Intermetallics

HU Jing;LIN Dongliang

Open Laboratory of Education Ministry of China for High Temperature Materials and TestsSchool of Materials Science and Engineering;;Shanghai Jiaotong University; Shanghai 200030;Department of Materials Science and Engineering; Jiangsu Polytechnic University; Changzhou 213016

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HU Jing; LIN Dongliang. Microstructural Evolution During Superplastic Deformation in Large-Grained Single Phase Ni-48Al Intermetallics. Acta Metall Sin, 2004, 40(5): 489-493 .

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Abstract Superplastic deformation has been found in large-grained Ni-48Al intermetallics with grain size of 200 μm. Metallographic examination shows that the average grain size of the tested material decreases during superplastic deformation and much finer grains could be obtained after superplastic deformation. TEM and EBSD show that there are great numbers of subgrain boundaries and the proportion of subgrain and low angle boundaries increases with the increase of strain. During superplastic deformation an unstable subgrain network forms, which absorbs gliding and climbing dislocations and transforms into low and high angle grain boundaries accommodated by subgrain boundary sliding, migration and rotation. The observed superplastic phenomenon was explained by continuously dynamic recovery and recrystallization.

Key words: Ni-48Al intermetallics large-grained

Received: 16 April 2003

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