MACROSCOPIC RESPONSE AND MICROSCOPIC MECHANISM OF ZIRCALOY-4 UNDER NONPROPORTIONAL LOADING

Acta Metall Sin

1998, Vol. 34

Issue (3): 242-248 DOI:

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MACROSCOPIC RESPONSE AND MICROSCOPIC MECHANISM OF ZIRCALOY-4 UNDER NONPROPORTIONAL LOADING

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XIAO Lin(State Key Laboratory for Mechanical Behaviour of Materials; Xi'an Jiaotong University; Xi'an 710049)KUANG Zhenbang(Department of Engineering Mechanics; Shanghai Jiaotong University; Shanghai 200030). MACROSCOPIC RESPONSE AND MICROSCOPIC MECHANISM OF ZIRCALOY-4 UNDER NONPROPORTIONAL LOADING. Acta Metall Sin, 1998, 34(3): 242-248.

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Abstract Monotonic and cyclic plastic deformation behaviour and microscopic mechanism of zircaloy-4 under biaxial tension loading along different loading paths were investigated. The results show that an obvious stress delay appears in comparison with the strain increment vector after the turning point of a strain path. The equivalent stress suddenly drops then increases, and the firstly softening and subsequently haxdening degrees are related to the turning angle values,the path length and turning direction. Therefore, the influence of the deformation history and the coupled effects among strain components on the response can not be neglected. By TEM, the deformed dislocation configurations are parallel dislocation lines in uniaxial tension with constraint condition, a lot of free dislocation lines between channeals in double-triangle, and embryonic cells in elliptical and circular loading, respectively. The correlation between macroscopic deformation behaviour and microscopic deformation structure is discussed, finally.

Key words: zircaloy-4 nonproportional loading constitutive equation microscopic mechanism dislocation structure

Received: 18 March 1998

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1998/V34/I3/242

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