Creep of a Fine-grained, Fully-lamellar, Two-phase TiAl Alloy at 760[degree]C. PDF Download
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![Creep of a Fine-grained, Fully-lamellar, Two-phase TiAl Alloy at 760[degree]C. PDF](https://books.google.com/books/content/images/frontcover/hdwHkAEACAAJ?fife=w150-h200)
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Creep of a TiAl alloy, having a composition of Ti-47Al-2Cr-2Nb (in atom%) and a fine-grained, fully-lamellar structure, was carried out at 760 C and stresses between 69--723 MPa. It was found that, in addition to having good room temperature properties, the alloy exhibits higher creep resistance than other TiAl alloys with a similar composition. Both the creep data and microstructures of the alloy suggest that there exists a change in deformation mechanism from a glide-controlled process at high stresses to a recovery-controlled process at low stresses. Also, microstructural evidence indicates that the rate-controlling recovery mechanism is the climb of dislocation segments pinned by ledges at[gamma]/[alpha][sub 2] interfacial boundaries.
![Creep of a Fine-grained, Fully-lamellar, Two-phase TiAl Alloy at 760[degree]C. PDF](https://books.google.com/books/content/images/frontcover/hdwHkAEACAAJ?fife=w80-h100)
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Creep of a TiAl alloy, having a composition of Ti-47Al-2Cr-2Nb (in atom%) and a fine-grained, fully-lamellar structure, was carried out at 760 C and stresses between 69--723 MPa. It was found that, in addition to having good room temperature properties, the alloy exhibits higher creep resistance than other TiAl alloys with a similar composition. Both the creep data and microstructures of the alloy suggest that there exists a change in deformation mechanism from a glide-controlled process at high stresses to a recovery-controlled process at low stresses. Also, microstructural evidence indicates that the rate-controlling recovery mechanism is the climb of dislocation segments pinned by ledges at[gamma]/[alpha][sub 2] interfacial boundaries.
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Languages : en
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Category : Science
Languages : en
Pages : 880
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Languages : en
Pages : 16
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Effects of W on the creep resistance of two nearly fully lamellar TiAl alloys with 1.0 and 2.0 at.%W have been investigated. In the low stress regime (LS) a nearly quadratic (1.5
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Languages : en
Pages : 9
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Deformation mechanisms and the role of interfaces in deformation twinning of a two-phase [TiAl /Ti3Al(?2)] lamellar alloy creep deformed at elevated temperatures have been investigated. Since the multiplication of lattice dislocations within both? and?2 lamellae is very limited at a low stress level due to a refined lamellar microstructure, the glide of interfacial dislocations on both?/?2 and?/? interfaces (i.e interface sliding) becomes an important deformation mode. Obstacles such as impinged lattice dislocations can impede the movement of interfacial dislocations, which glide in a cooperative fashion along the lamellar interfaces. The impediment of dislocation motion subsequently causes a dislocation pile-up in front of obstacles as creep strain accumulates. When the crystals deform at high stress level, deformation twinning becomes a predominant deformation mode. Deformation twins are found to nucleate from the interfaces as a result of a local stress concentration generated from dislocation pile-ups. It is suggested that the deformation twinning in lamellar TiAl/Ti3Al crystals can be vieived as a stress relaxation process for the concentration of stress at the head of each dislocation pile-up. An interface-assisted twinning mechanism is accordingly proposed and discussed.
![Creep of a Fully Lamellar [gamma]-Tial Alloy PDF](https://books.google.com/books/content/images/frontcover/otoCswEACAAJ?fife=w80-h100)
Author: Francoise Herrouin
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Languages : en
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Category : Reduced gravity environments
Languages : en
Pages : 6
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