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4808312 
Journal Article 
Microstructural Evolution and High Strain Rate Mechanical Property of Cobalt Superalloy Contain Titanium 
Chen, TaoH; Chen, TYou 
2015 
0 
Sains Malaysiana
ISSN: 0126-6039 
44 
12 
1751-1756 
WOS:000369532800014 
The high strain rate properties and microstructure observations of cobalt base superalloyd contains 0.9% Ti were investigated using Hopkinson bar. These cobalt base superalloys are tested at strain rates of 2x10(3), 3x10(3) and 4x10(3) s(-1) and at different temperatures (25, 500 and 900 degrees C), respectively. It is found that the stress flow and strain rate sensitivity increases with increasing strain rate but decrease with increasing temperature. The microstructure observations confirm that the high strain rate mechanical behavior of the cobalt base superalloys specimens are directly related to the effects of the strain rate, temperature and the evolution of the microstructural texture. The strengthening mechanism in cobalt base superalloys is the multiplication of dislocation. The dislocation density increases with increasing strain rate but decrease with increasing temperature. 
Cobalt superalloy; dislocation; strain rate; Ti additions