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《Journal of Experimental Mechanics》 2007-02
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Experimental Study for the Influence of Twinning on the Plastic Deformation of Pure Polycrystalline Titanium

CAI Sheng-qiang,WANG Yang,XIA Yuan-ming(Department of Mechanics and Mechanical Engineering,Key Laboratory of Mechanical Behavior and Design of Materials of CAS,University of Science and Technology of China,Hefei,Anhui,230027,China)  
Quasi-static monotonic tension,quasi-static monotonic compression and loading-unloading compression experiments up to different strains were performed under different temperatures in this paper.And metallographic observations of fractured specimens obtained from quasi-static monotonic tension experiments and specimens with different compression strains obtained from the loading-unloading compression experiments were also carried out.Through comparing the results of quasi-static monotonic tension and quasi-static monotonic compression of polycrystalline pure titanium,and comparing the correspondent optical microscopy observation,the quantitative relationship of the twinning-induced increase of flow stress and the strain is obtained.The phenomenological analytical relationship between the twinning-induced increase of flow stress and the strain is established based on the Hall-Petch mechanism and the evolution equation of the volume fractions of twins.The experimental results show that the present phenomenological relationship satisfactorily describes the influence of twinning on the plastic deformation of polycrystalline pure titanium.
【Key Words】: twinning hardening modulus flow stress
【Fund】: 国家自然科学基金(编号:10472110)资助
【CateGory Index】: O733-33
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