Submitted on: 09 August 2011.
Revised on: 30 August 2011.
Accepted on: 20 October 2011.
___________________Acta Metallurgica Sinica-English Letters
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Submitted on: 27 December 2014.
Revised on: 19 February 2015.
Accepted on: 02 March 2015.
___________________Acta Metallurgica Sinica-English Letters
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Submitted on: 16 August 2003.
Revised on: 07 October 2003.
Accepted on: 01 November 2003.
___________________Acta Metallurgica Sinica-English Letters
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Submitted on: 11 April 2004.
Revised on: 18 June 2004.
Accepted on: 10 August 2004.
___________________Acta Metallurgica Sinica-English Letters