Key;
Laboratory;
for;
Mechanical;
Structure;
Strength;
and;
Vibration,;
School;
of;
Aerospace,;
Xi'an;
Jiaotong;
University,;
Xi'an;
710049,;
China;
Key;
Laboratory;
of;
Porous;
Metal;
Materials,;
Northwest;
Institute;
for;
Nonferrous;
Metal;
Research,;
Xi'an;
710016,;
China;