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Size and distribution of particles and voids pre-existing in equal channel angular pressed 5083 Al alloy: their effect on cavitation during low-temperature superplastic deformation

Title
Size and distribution of particles and voids pre-existing in equal channel angular pressed 5083 Al alloy: their effect on cavitation during low-temperature superplastic deformation
Author
신동혁
Keywords
5083 Al; ECAP; Ultrafine grains; Voids; Second phase particles; Cavitation; Low-temperature superplasticity; SEVERE PLASTIC-DEFORMATION; AL-MG ALLOY; SUBMICROMETER-GRAINED 5083-AL-ALLOY; CAVITY GROWTH; BEHAVIOR; FLOW
Issue Date
2004-04
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A, v. 371, No. 1-2, Page. 178-186
Abstract
An ultrafine grained 5083 Al alloy was prepared by equal channel angular pressing with route Bc and an effective strain of ∼4 or ∼8. The changes of the size and distribution of second phase particles and voids pre-existing in the alloy during equal channel angular pressing (ECAP) were examined in detail. Under the present ECAP conditions, a portion of particles of 1.5–3.5 μm substantially increased. However, the further break-up of particles with these sizes became less significant and they were to be distributed more uniformly throughout the sample with increasing the ECAP pass from 4 to 8. In addition, these particles were likely to act as the preferential cavity nucleation sites during low-temperature superplastic deformation of the alloy. The population of voids with the size of 0.5–1.5 μm remarkably increased after ECAP. An analysis revealed that these voids were difficult to be sintered out at low-temperature superplastic deformation temperatures prior to deformation and might grow to larger size cavities. From the present results and analysis, it is suggested that the number of the ECAP pass less than that resulting the largest elongation may be preferable in the viewpoint of cavitation damage and commercial application of low-temperature superplasticity of ultrafine grained Al alloys, if moderate superplastic elongation is ensured.
URI
https://www.sciencedirect.com/science/article/pii/S0921509303014515#!https://repository.hanyang.ac.kr/handle/20.500.11754/141919
ISSN
0921-5093
DOI
10.1016/j.msea.2003.11.042
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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