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creep Behaviour of Fe-Mn Binary Alloys

Chinese Physics Letters 2006年第11期23卷 3037-3040页

作者： O. Sahin, N. Ucar Department of Physics Art and Science Faculty Suleyman Demirel University Isparta Turkey

Tensile creep behaviour of fine-grained Fe-Mn binary alloys containing 0.42-1.21 wt. % Mn has been investigated in the temperature range from room temperature to 475K under 10-50 MPa. Tensile tests are carried out with a constant cross-head speed under uniaxial load at a strain rate 10^-4s^-1. Stress exponent and activation energy are determined to clarify deformation mechanism. The obtained variation of steady state creep rate with respect to the applied stress for Fe-Mn binary alloys exhibits two distinct regimes at about 20 MPa, indicating a possible change in creep mechanism. The average stress exponent is approximately 2.2, which is a characteristic of grain boundary sliding in the alloys. The activation energy for plastic flow varies from 135 to 92k J/mol, depending on the Mn content.

关键词： high-temperature creep STEADY-STATE creep PB-SB ALLOYS TRANSFORMATION STRESS

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Rheological Regime of the Upper Mantle beneath the Taiwan Strait and Its Tectonic Significance

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Acta Geologica Sinica(English Edition) 1995年第3期69卷 259-271,340页

作者： H.W.GreenⅡ U яivetsity of California RiuersideC A 92521U.S.A.

This paper deals with deformation textures and fabrics of mantle-derived xenoliths and dislocation microstructures of olivine in the upper mantle in the Penghu Islands, Taiwan. According to the calculation of the chemical composition of xenolith minerals (pyroxene), the equilibrium temperatures and pressures were 986-1116@ and 1.50-2.60 GPa, respectively. Deformation events in the upper mantle may fall into three sequences' (1) uniform steady-state flow deformation with high temperatures and low stresses, (2) shear flow deformation with high temperatures and relatively high stresses on diapiric margins of the upper mantle, and (3) extraction deformation of {110} glide bands with low temperatures and high strain rates. Deformation events and thermal structure of the upper mantle in the study area show that eastern Fujian and the Penghu Islands are characterized by very similar rheological properties of the upper mantle. Volcanism of basalts in the Penghu Islands is related to hot spots of the upper mantle under neath the Taiwan Strait, and diapirism and upwelling of the upper mantle are the dominant factors responsible for rifting of the continental margins in eastern China.

关键词： mantle-derived xenolith high-temperature creep rheology of the upper mantle rifting Penghu Islands

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