Mechanical behavior of monocrystalline aluminum-lithium alloy at low temperatures
- Academia Sinica, Shenyang (China). State Key Lab. for Fatigue and Fracture of Materials
Investigations have indicated that at low temperature aluminum- lithium alloys display improved toughness and an improved strength-toughness relationship. The yield strength, ultimate tensile strength, elongation and the fracture toughness increase with decreasing temperatures. Several mechanisms have been proposed to explain this most striking feature. Webster claimed that low melting point impurities, such as sodium and potassium, are responsible for the improvement of mechanical properties in Al-Li alloys at low temperatures. However, Venkateswara Rao et al. indicated that the increased delamination at low temperatures can increase the degree of in-plane crack deflection, resulting in toughening of the alloys. On the basis of their own results, Xu and coworker pointed out that the improvement of tensile and fatigue properties at liquid nitrogen temperatures is also presumably attributable to the delamination. Therefore, the mechanisms responsible for the variation in mechanical properties with temperature are not currently well-understood. In order to elucidate the real situation, single crystals of a binary aluminum-lithium alloy were adopted in the present study. This paper is devoted to the description of the behavior of the load-displacement curves and the associated slip traces on the sample surfaces.
- OSTI ID:
- 6890906
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 31:11; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
Similar Records
The effects of prolonged thermal exposure on the fracture and fatigue behavior of aluminum-lithium alloy 8090
Mechanical behavior of aluminum-lithium alloys at cryogenic temperatures