Constitutive Relationship of Hot Deformation of AZ91 Magnesium Alloy

Acta Metall Sin

2008, Vol. 44

Issue (11): 1378-1383 DOI:

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Constitutive Relationship of Hot Deformation of AZ91 Magnesium Alloy

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北京科技大学

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. Constitutive Relationship of Hot Deformation of AZ91 Magnesium Alloy. Acta Metall Sin, 2008, 44(11): 1378-1383 .

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Abstract

Hot compression deformation of AZ91 magnesium alloy has been performed on Gleeble-1500 under conditions of strain rates of 0.001～1s-1 and deformation temperatures of 250～400℃，the flow stresses in different deformation conditions are investigated. The results show that the flow stress is significantly affected by both deformation temperature and strain rate，the flow stress decreases with the deformation temperature increasing and strain rate decreasing. The relations of the deformation activation energy and stress exponent with strain are obtained using the hyperbolic-sine mathematics model，and the hot deformation constitutive relationship being established. Comparing with experimental results，it is proved that the model reflects the real feature of the deformation of AZ91 alloy.

Key words: magnesium alloy constitutive relationship hot deformation deformation activation energy

Received: 26 March 2008

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I11/1378

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