MECHANISM FOR THE OCCURRENCE OF SERRATED FLOW IN Al-Li SINGLE CRYSTALS

Acta Metall Sin

1998, Vol. 34

Issue (6): 603-608 DOI:

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MECHANISM FOR THE OCCURRENCE OF SERRATED FLOW IN Al-Li SINGLE CRYSTALS

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TIAN Boohui(Beliing Institute of Aeronautical Materials; Beijing 100095)LI Huanxi; ZHANG Youggang; CHEN Changqi(Beijing University of Aeronautics and Astronautics; Beijing 100083)Corresponent: TIAN Baohui; Tel: (010)62456622-5021 Fax:(010)62456925. MECHANISM FOR THE OCCURRENCE OF SERRATED FLOW IN Al-Li SINGLE CRYSTALS. Acta Metall Sin, 1998, 34(6): 603-608.

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Abstract Strain rate sensitivity varies in a different mariner in Al-Li single crystalsunder different ageing conditions. Stress drops change irregularly with increasing strain andbear no relation to elapsed time for individual serrations. Stress drops and elapsed time duringserrated flow Primarily distribute within their low values under peak aged condition, comparedwith underaged and overaged states. These behaviors may be explained by sheared σ＇ particlesinducling serrated flow.

Key words: strain rate sensitivity stress drop elapsed time serrated flow

Received: 18 June 1998

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