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Submitted on: 21 April 1999.
Revised on: 08 June 1999.
Accepted on: 30 July 1999.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS
Submitted on: 12 December 1999.
Revised on: 05 January 2000.
Accepted on: 31 January 2000.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS
Submitted on: 02 August 2000.
Revised on: 13 November 2000.
Accepted on: 30 November 2000.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS
Submitted on: 25 July 2008.
Revised on: 17 September 2008.
Accepted on: 21 October 2008.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS
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