TY - JOUR

T1 - Effect of thermal and mechanical treatments on the hot working response of Mg-3Sn-1Ca alloy

AU - Prasad, Y. V.R.K.

AU - Rao, K. P.

AU - Hort, N.

AU - Kainer, K. U.

PY - 2010/2

Y1 - 2010/2

N2 - The effects of homogenization treatment and high-temperature extrusion on the hot working behavior of Mg-3Sn-1Ca alloy have been studied with a view to find an optimum processing route for the manufacture of wrought products. Processing maps and kinetic parameters have been obtained from the flow stress data recorded in hot compression experiments in the temperature range of 300- 550 °C and strain rate range of 0.0003 - 10 s-1. These reveal that the homogenization treatment has only a marginal effect on the hot workability, the result attributable to the high thermal stability of CaMgSn particles in the microstructure. High temperature extrusion, however, lowers the hot working temperature significantly (by about 150 °C) and this has been attributed to grain refinement during primary processing. The mechanisms of hot deformation remained unchanged by the above treatments and the apparent activation energies for hot deformation are higher than those for self-diffusion suggesting that CaMgSn particles in the matrix cause large back-stress.

AB - The effects of homogenization treatment and high-temperature extrusion on the hot working behavior of Mg-3Sn-1Ca alloy have been studied with a view to find an optimum processing route for the manufacture of wrought products. Processing maps and kinetic parameters have been obtained from the flow stress data recorded in hot compression experiments in the temperature range of 300- 550 °C and strain rate range of 0.0003 - 10 s-1. These reveal that the homogenization treatment has only a marginal effect on the hot workability, the result attributable to the high thermal stability of CaMgSn particles in the microstructure. High temperature extrusion, however, lowers the hot working temperature significantly (by about 150 °C) and this has been attributed to grain refinement during primary processing. The mechanisms of hot deformation remained unchanged by the above treatments and the apparent activation energies for hot deformation are higher than those for self-diffusion suggesting that CaMgSn particles in the matrix cause large back-stress.

KW - Homogenization

KW - Hot extrusion

KW - Kinetic analysis

KW - Mg-Sn-Ca alloy

KW - Processing map

KW - Workability optimization

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=77952642303&partnerID=8YFLogxK

U2 - 10.3139/146.110269

DO - 10.3139/146.110269

M3 - Journal articles

AN - SCOPUS:77952642303

VL - 101

SP - 300

EP - 306

JO - International Journal of Materials Research

JF - International Journal of Materials Research

SN - 1862-5282

IS - 2

ER -