College;
of;
Materials;
Science;
and;
Engineering,;
Institute;
of;
Powder;
Metallurgy,;
State;
Key;
Laboratory;
for;
Powder;
Metallurgy,;
Central;
South;
University,;
Changsha,;
Hunan;
410083,;
P.R.;
China;
College;
of;
Mechanical;
Engineering,;
Xiangtan;
University,;
Xiangtan,;
Hunan;
411105,;
P.R.;
China;