Cavitation and fracture in high strain rate superplastic Al alloy/Si3N4(p)composites
作者:
IwasakiH.,
MabuchiM.,
HigashiK.,
期刊:
Materials Science and Technology
(Taylor Available online 1996)
卷期:
Volume 12,
issue 6
页码: 505-512
ISSN:0267-0836
年代: 1996
DOI:10.1179/mst.1996.12.6.505
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractConstant stress tensile tests have been carried out and cavitation resulting from tensile superplastic flow has been examined using metallographic and densitometric techniques in high strain rate superplastic Al–Mg–Si/Si3N4(p)and Al–Cu–Mg/Si3N4(p)composites (where‘p’denotes particulate). The elongations to failure depended strongly on the applied stress, and the elongations decreased rapidly at high stresses within the range having the same stress exponent of 2. Cavities developed parallel to the tensile direction at low stresses, but perpendicular to the tensile direction at high stresses. The development of cavities perpendicular to the tensile direction is probably responsible for low elongations in the high stress range. The rates of increase of the cavity volume for the composites were much lower than that for a superplastic 7475 alloy. This can probably be attributed to the presence of a discontinuous liquid phase for the composites.MST/3354
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