Time-dependent stress concentration and microcrack nucleation in TiAl
Localized stress evolution associated with the interaction of slip or twinning with an interface is treated by means of a superposition of the {open_quotes}internal loading{close_quotes} of a crystalline subsystem by dynamic dislocation pile-up and the stress relaxation by climb of interfacial dislocations. The peak value of a stress concentration factor depends on both the angular function that includes the effect of mode mixity and the ratio of characteristic times for stress relaxation and internal loading. The available experimental data on orientation and strain-rate dependences of interfacial fracture mode in polysynthetically twinned TiAl crystals are discussed in view of the theoretical concepts presented in this paper.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Alexander von Humboldt-Stiftung, Bonn (Germany)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 86925
- Report Number(s):
- CONF-9502109-1; ON: DE95014268; TRN: 95:005520
- Resource Relation:
- Conference: International symposium on gamma titanium aluminides (ISGTA-95), Las Vegas, NV (United States), 12 Feb - 16 Mar 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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