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| EFFECT OF PRECIPITATE ON PLC EFFECT IN 2024 Al ALLOY |
| XIONG Shaomin; ZHANG Qingchuan; CAO Pengtao; XIAO Rui |
| Key Laboratory of Mechanical Behavior and Design of Materials; Chinese Academy of Sciences; University of Science and Technology of China; Hefei 230027 |
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Cite this article:
XIONG Shaomin ZHANG Qingchuan CAO Pengtao XIAO Rui. EFFECT OF PRECIPITATE ON PLC EFFECT IN 2024 Al ALLOY. Acta Metall Sin, 2009, 45(7): 892-896.
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Abstract It is normally accepted that the interaction among solute atoms, dislocations
and precipitate leads to Portevin--Le Chatelier (PLC) effect during the plastic
deformation of alloys. Precipitate is directly responsible for some inverse behavior of
PLC effect, such as the inversion of the temperature dependence of critical strain;
because these behaviors appear only when precipitate exist in the alloys. In this paper,
the solute concentration in matrix and the fraction of the precipitate in 2024 Al alloy
are changed by heat treatment. Subsequently, tensile experiments are conducted at
room temperature (25 ℃) and low temperature (-100 ℃) on these treated specimens.
The magnitude of serration and the critical strain of the serrated flow are analyzed and
the results show that the diffusing solute atoms are necessary for the appearance of
PLC effect while the cutting of the precipitate particles alone can not lead to this
phenomenon. The mobile dislocations will be blocked and piled up strongly in the front
of precipitate and thus precipitate will have an influence on PLC effect. This influence
is obvious during tensile tests at medium strain rate.
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Received: 23 February 2009
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| Fund: Supported by National Natural Science Foundation of China (Nos.10872189 and 10732080) |
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