Crystallographic features of intralamellar fracture in a fully lamellar TiAl based alloy
- Univ. of Birmingham, Edgbaston (United Kingdom). Interdisciplinary Research Centre in Materials for High Performance Applications
From fatigue fracture surface examination on fully lamellar microstructure of {gamma}-TiAl alloys, intralamellar crack propagation has been reported recently. Compared with the investigation of translamellar and interlamellar fractures, the characteristic features of intralamellar fatigue fracture have not been investigated in detail. Intralamellar crack propagation on the fatigue fracture surface is found same as interlamellar propagation, parallel to lamellar interfaces but is characterized by complicated geometric patterns of microcracking traces on consecutive lamellar plates, while translamellar propagation occurs transverse to the lamellar boundaries. These geometric patterns may relate to deformation traces occurring in areas local to the growing crack tip. An investigation into intralamellar fracture to explain its crystallographic features is merited. In this paper attention will be concentrated on fully lamellar microstructure subjected to cyclic loading since this condition demonstrates a considerable amount of intralamellar fatigue fracture and can achieve improved crack growth resistance relative to near lamellar and duplex microstructures.
- OSTI ID:
- 619465
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Relationships of slip morphology, microcracking, and fracture resistance in a lamellar TiAl-alloy
In situ observation of fracture process of a TiAl alloy with fully lamellar microstructure