Studies of lattice imperfections in deformed aluminum-based lithium alloys by X-ray diffraction

Ghosh, Jiten; Mukherjee, P.; Barat, P.; Chattopadhayay, S. K.; Chatterjee, Sudipta; Meikap, Ajit Kumar

doi:10.1007/s11661-006-0239-z

Cited by 2 publications

(1 citation statement)

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“…where a is a constant (equal to 0?06), G is the shear modulus, d is the stacking fault width and other symbols have the usual meanings. The XRD study of lattice imperfections in deformed Al based Li alloys by Ghosh et al 40 concluded that Al retains its high stacking fault energy irrespective of the Li content. The solid solution strengthening by the substitutional Li solute in Al is due to modulus interaction which is insensitive to temperature 38 and also the activation energy for diffusion is only marginally decreased by the addition of Li.…”

Section: Effect Of Lithium Additionmentioning

confidence: 99%

Characterisation of dynamic recovery during hot deformation of spray formed Al–Li alloy (UL40) using processing map approach

Reddy¹,

Srinivasan²,

Gokhale³

et al. 2008

Materials Science and Technology

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Processing maps, also known as power dissipation maps, for spray formed Al-Li alloy (UL40), encompassing a wide range of hot working temperature (375-575uC) and strain rate (3610 24 -10 1 s 21 ) have been developed. The constant true strain rate compression tests were carried out under isothermal conditions to generate the stress-strain data required for computing the efficiency of power dissipation g. The maps exhibit three distinct regimes. The two high efficiency (.55%) regimes occur at the low strain rates (,10 23 s 21 ) and at the high strain rates (.1 s 21 ), and the other with moderate efficiency values (20-23%) occurs at the intermediate strain rate (10 21 s 21 ). The latter one has been interpreted to be associated with dynamic recovery (DRV) process while the other two regimes have been found to be associated with cracking processes. The DRV regime in the map has been characterised in terms of stress-strain response, microstructure and tensile ductility. The kinetic rate analysis carried out in the DRV regime suggested that the thermally activated cross-slip is the rate controlling mechanism for the DRV process. The effect of Li addition on the optimum deformation condition of DRV in Al has also been discussed qualitatively.

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Section: Effect Of Lithium Additionmentioning

confidence: 99%