Elastic-plastic crystal mechanics for low symmetry crystals

Schoenfeld, Scott E.; Ahzi, Saı̈d; Asaro, R.J.

doi:10.1016/0022-5096(94)00065-d

Cited by 48 publications

(15 citation statements)

References 34 publications

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“…It has been reported that the a¢¢ orthorhombic martensite has a low symmetry, resulting in an insufficient number of independent slip systems. [28] The activated dislocations in the bcc b parent phase with relatively high symmetry were difficult to pass through the a¢¢ orthorhombic martensite with a low symmetry. Consequently, incompatible deformation could be produced between them.…”

Section: B Grain Refinement Mechanismmentioning

confidence: 99%

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Chen

Sun

Lin

et al. 2011

Metall Mater Trans A

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The microstructural evolution and grain refinement mechanisms of a Ti-10V-2Fe-3Al alloy, b-solution quenched and cold forged (CF) to strains of 0.1, 0.35, and 1.2 have been investigated using optical microscopy (OM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the stress-induced martensitic transformation became a predominant deformation mode in the metastable Ti-10V-2Fe-3Al alloy during cold forging. These martensites a¢¢ repeatedly divided the original b parent phase into a large number of micronsized blocks when the forging strain was 0.1. Shear bands were observed to traverse a¢¢/b lamellae and resulted in a significant grain refinement of the b phase, as the forging strain increased to 0.35. The degree of grain refinement inside shear bands was higher than the outside. Nanocrystalline and amorphous structures were produced in local areas of the original b phase, when the forging strain rose to 1.2. This dramatic grain refinement in the metastable Ti-10V-2Fe-3Al alloy could be attributed to the stress-induced martensitic transformation promoting the initiation and growth of shear bands across a¢¢/b lamellae. More dislocations were produced and accumulated inside grains to accommodate plastic deformation. The crystal structure was collapsed and an amorphous structure was formed as soon as the dislocation density was accumulated to a critical value of 10 14 /cm 2 . Moreover, some of the reverse martensitic phase transformation, a¢¢fib, was observed to contribute to grain refinement of Ti-10V-2Fe-3Al alloy as well.

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Section: B Grain Refinement Mechanismmentioning

confidence: 99%

Deformation-Induced Grain Refinement and Amorphization in Ti-10V-2Fe-3Al Alloy

Chen

Sun

Lin

et al. 2011

Metall Mater Trans A

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“…It is apparent that stress levels within the polycrystalline aggregate will be elevated due to this lack of sufficient independent slip systems (Parks and Ahzi, 1990;Schoenfeld et al, 1995). However, a quantitative assessment of the contribution of this constraint to overall work-hardening rates has not yet been considered in detail for any system.…”

mentioning

confidence: 99%

Strain Hardening

Gray¹,

Pollock²

2002

Intermetallic Compounds ‐ Principles and Practice

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“…Advanced micro-macro models which may offer more elaborate treatment of grain interactions with the neighborhood of individual grains include: the ''n-site" or ''multi-site" models (Ahzi, 1987;Delannay et al, 2002Delannay et al, , 2009Lebensohn and Canova, 1997;Sarma and Dawson, 1996;Van Houtte et al, 2005); the fast Fourier transform approaches (Lebensohn et al, 2007(Lebensohn et al, , 2008; the finite element based models (CPFEM) (Bate and Quinta da Fonseca, 2004;Beaudoin et al, 1993;Delannay et al, 2009;Grytten et al, 2008;Kalidindi et al, 2009;Kanjarla et al, 2009;Si et al, 2008); the GIA approach (Crumbach et al, 2001;Engler et al, 2005;Leffers and Ray, 2009;Van Houtte et al, 2004, 2005; and the LAMEL type models (Kanjarla et al, 2009;Lee et al, 2002;Van Houtte et al, 2005. Other types of 'intermediate' models exist for low symmetry crystals (Ahzi et al, 1993;Parks and Ahzi, 1990;Prantil et al, 1995;Schoenfeld et al, 1995).…”

Section: Introductionmentioning

confidence: 99%