Crack initiation mechanism in lanthanum-doped titanium-zirconium-molybdenum alloy during sintering and rolling
作者： Ping Hu , Yu-hang Zhou , Jie Deng , Shi-lei Li , Wen-jing Chen
DOI: 10.1016/J.JALLCOM.2018.02.191
关键词: Nucleation 、 Fracture (geology) 、 Powder metallurgy 、 Stress concentration 、 Composite material 、 Alloy 、 Sintering 、 Cleavage (crystal) 、 Materials science 、 Fracture mechanics
摘要: Abstract Lanthanum-doped titanium-zirconium-molybdenum (La-TZM) alloy was prepared by powder metallurgy and rolling process. The processing crack initiation mechanisms of La-TZM after sintering, hot cold were studied scanning transmission electron microscopy. results show that the doped La(NO3)3, TiH2 ZrH2 have finer secondary phase in plate. fracture mode sintering billet is inter-granular, but surface exhibited transgranular cleavage. However, quasi-cleavage fracture. particles tend to hinder movement dislocations causing pile-up. resulting tensile stress can accelerate cracks nucleation growth, propagation will be deflected particles. avoided reducing local concentration caused dislocations.
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