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Submitted on: 28 February 2000.
Revised on: 30 March 2000.
Accepted on: 23 April 2000.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS
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Submitted on: 29 April 2005.
Revised on: 21 July 2005.
Accepted on: 12 September 2005.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS
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Submitted on: 19 April 2019.
Revised on: 15 June 2019.
Accepted on: 05 August 2019.
___________________ACTA METALLURGICA SINICA---SCIENCE PRESS