EFFECTS OF GRAIN SIZE AND THICKNESS ON CREEP DEFORMATION OF ALUMINIUM THIN FOILS WITH MESO--SCALE

Acta Metall Sin

2008, Vol. 44

Issue (3): 336-340 DOI:

Research Articles

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EFFECTS OF GRAIN SIZE AND THICKNESS ON CREEP DEFORMATION OF ALUMINIUM THIN FOILS WITH MESO--SCALE

Zhou Qing

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Zhou Qing. EFFECTS OF GRAIN SIZE AND THICKNESS ON CREEP DEFORMATION OF ALUMINIUM THIN FOILS WITH MESO--SCALE. Acta Metall Sin, 2008, 44(3): 336-340 .

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Abstract It is found that the plastic deformation behavior of the materials in meso-scale is different from that in macro scale, also that in micro scale. The importance of studying the high temperature deformation behavior of those materials is in that it paves the ways for basic forming discipline of microforming and developing microforming technology. Constant applied stress creep experiments at 200C of aluminum alloy thin foils with the thickness of 10～350m are carried out. The effect of the thickness and the grain size to the strain rate is studied. Subgrains are found near the grain boundary under the observation by Transaction Electronic Microscopy. The results show that using the parameter of t/d, the size effect of deforming can be better summarized. The strain rate is fast when t/d is reduced. It is found that the parameter of t/d has affected to the stress exponent. An equation is obtained to correlate the strain rate with t/d. The relationship between the stress exponent and t/d simulated by the equation is perfectly correspondent to the experimental data.

Key words: creep aluminium alloy thin foil microforming thickness grain size

Received: 13 August 2007

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