The role of elastic and plastic anisotropy in intergranular spall failure

AbstractThe anisotropy in room temperature plastic deformation has been investigated in single α(HCP)/β(BCC) colonies of a commercial α/β titanium alloy (Ti-6Al-2Sn-4Zr-2Mo-0.1Si) oriented for activation of individual basal slip systems. Detailed transmission electron microscopy (TEM) studies of the slip transmission mechanisms through the α/β interfaces have been performed to elucidate the role of these interfaces in determining yield and strain hardening behavior. Significant anisotropy in the yield strengths and hardening rates for the 3 unique basal slip systems is measured, and is attributed to the different slip transmission mechanisms active due to the near-Burgers orientation relationship existing between α- and β-phases. These results are should be transferable to other alloy systems exhibiting this orientation relationship.

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The role of plastic anisotropy in the fatigue behavior of zircaloy

Metallurgical and Materials Transactions B ◽

10.1007/bf02680611 ◽

1972 ◽

Vol 3 (1) ◽

pp. 315-322 ◽

Cited By ~ 19

Author(s):

D. Lee

Keyword(s):

Fatigue Behavior ◽

Plastic Anisotropy

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Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B

International Journal of Plasticity ◽

10.1016/j.ijplas.2004.05.018 ◽

2005 ◽

Vol 21 (6) ◽

pp. 1161-1193 ◽

Cited By ~ 1088

Author(s):

Sean R. Agnew ◽

Özgür Duygulu

Keyword(s):

Magnesium Alloy ◽

Basal Slip ◽

Plastic Anisotropy ◽

Magnesium Alloy Az31b

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Interfacial Properties and Mechanical Behavior of Titanium Aluminides

MRS Proceedings ◽

10.1557/proc-492-345 ◽

1997 ◽

Vol 492 ◽

Author(s):

M. H. Yoo ◽

C. L. Fu

Keyword(s):

Titanium Aluminides ◽

Boundary Energy ◽

Plastic Anisotropy ◽

Interfacial Fracture ◽

Two Phase ◽

Deformation And Fracture ◽

Crack Tip Plasticity ◽

Lamellar Boundary ◽

Lamellar Interfaces

ABSTRACTThe role of various interfaces in deformation and fracture behavior of two-phase TiAl-Ti3Al alloys is analyzed on the basis of the specific interfacial and surface energies determined from ab initio calculations. The propensity of twinning observed in these alloys is consistent with the low true-twin boundary energy. The strong plastic anisotropy reported in TiAl polysynthetically twinned (PST) crystals is attributed partly to the localized slip along lamellar interfaces, thus lowering the yield stress for soft orientations. Interfacial fracture energies are estimated to be the highest for the α2/γ lamellar boundary and the lowest for the 120° rotational γ/γ boundary. The fracture mode mixity plays an important role in the crack-tip plasticity by ordinary slip and true-twinning, leading to translamellar and interfacial fracture.

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