Mechanisms of brittle intergranular fracture in Al–Li alloys and comparison with other alloys

2002 ◽  
Vol 82 (17) ◽  
pp. 3361-3373 ◽  
Author(s):  
S. P. Lynch ◽  
B. C. Muddle ◽  
T. Pasang
Keyword(s):  
Intergranular Fracture ◽  
Brittle Intergranular Fracture

Influence of Ni Addition on Mechanical Properties and Fracture Behaviors of Ir-15Nb Two-Phase Refractory Superalloys

1998 ◽  
Vol 552 ◽  
Author(s):  
Yuefeng Gu ◽  
Y. Yamabe-Mitarai ◽  
Y. Ro ◽  
T. Yokokawa ◽  
H. Harada
Keyword(s):  
Mechanical Properties ◽  
Intergranular Fracture ◽  
Coherent Structure ◽  
Room Temperature ◽  
Two Phase ◽  
Ni Content ◽  
Ni Addition ◽  
Fracture Behaviors ◽  
Materials Used ◽  
Brittle Intergranular Fracture

ABSTRACTIr-based alloys with fcc-L12 two-phase coherent structure, which are called “refractory superalloys”, have good potentiality as structure materials used at ultra-high temperatures up to 2000 °C. Preliminary results showed that the refractory superalloys failed predominately by brittle intergranular fracture at room temperature even though they showed higher strength at that temperature. This paper will present the influence of nickel (Ni) addition on mechanical properties and fracture behaviors of one of these alloys, Ir-15at%Nb. The results indicated that Ni addition was beneficial to the compression ductility and strength of two-phase Ir-15at%Nb alloy when Ni content was below the optimum content.

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