Transient and steady state creep of Pb – 20 wt % Bi during phase Transformation | ||||
| Egyptian Journal of Solids | ||||
| Article 12, Volume 23, Issue 1, 2000, Page 129-135 PDF (117.8 K) | ||||
| DOI: 10.21608/ejs.2000.151482 | ||||
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| Abstract | ||||
| ated using various stresses ranging from 4.5 MPa to 7 MPa in the temperature range from 343K to 423K in steps of 10 K. The purpose of this study is to explore the behavior of this alloy under different temperatures during the transformation. Our results show that the transient creep < br />parameters n and β increased extensively with increasing the deformation temperature and exhibited peaks at 363 K. This behavior illustrates the main processes that associated with the release of the stored deformation energy including the redistribution and rearrangement of the dislocations in the network at transformation. The relation between the transient creep parameter β and the steady state creep rate ξ st gives the exponent (γ) which ranges from 0.67 to 0.70, characteristic in the temperature region from 363 K to 383 K might be attributed the dislocation of β - phase. The peak value of strain rate sensitivity parameter m of the steady state creep was 0.66. The activation energies obtained near and after the phase transformation were found to be 0.065eV to 0.65eV for transient creep and 0.26eV to 0.65eV for steady state creep in low and high temperature ranges, respectively. These values characterized dislocation cross–slipping and dislocation climb as rate controlling mechanisms for creep in this alloy | ||||
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