C.L.LIU ^1, , H.AZIZI-ALIZAMINI ^2, , N.C.PARSON ^3, , W.J.POOLE ^4, , Q.DU ^5,

1.Department of Materials Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada;
2.Department of Materials Science and Engineering, McMaster University, Hamilton L8S 4L7, Canada;
3.Rio Tinto, Arvida Research and Development Centre, P. O. Box 1250, Jonquière (QC) G7S 4K8, Canada;
4.Department of Materials Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada;
5.SINTEF Materials and Chemistry, P. O. Box 4760 Sluppen, 7456 Trondheim, Norway