Formation of structural L12 compounds in the ternary Al/1bTi/1bCr system

Age Hardening of Ultrafine Grained Al-Ti-Cr Alloys Fabricated by Continuous Electron Beam Evaporation

“…The average composition of the Ti and Cr enriched region is approximately Al 77 Cr 10 Ti 10 O 3 . Compared to the equilibrium composition of the ternary L1 2 phase, Al 65 Cr 10 Ti 25 , 13) the concentration of Ti is substantially lower. This may be the reason why the presence of the L1 2 nanoparticles were not clearly observed with the conventional TEM observation in the peak hardness condition.…”

“…It is known that the L1 2 phase can be stabilized by substituting Al with Mn, 12) Cr, 13) and Ni, 14) thus there is a possibility to stabilize the L1 2 Al 3 Ti phase with respect to the D0 22 Al 3 Ti by adding Cr, Mn, and Ni. In the present study, therefore, Al-Ti-Cr ternary supersaturated alloys with ultrafine grains have been prepared by the continuous electronbeam evaporation technique to disperse fine stable and coherent precipitates, and their age-hardening behavior has been investigated in view of the hardness and the microstructures.…”

Solidification-Path and Microstructure of Al-Ti-Cr Alloy Analyzed by Progressive-Type Solidification Equation

“…Since the information on the solidification process in arc-melting or unidirectional solidification is not sufficient for this Al-Ti-Cr system, the microstructure couldn't be controlled well and contains defects such as non-equilibrium second phases and boids after solidification or heat treatment. [7][8][9] In this study, to evaluate the solidification path and non-equilibrium solidification microstructures of (Al,Cr) 3 Ti alloys, the new progressive-type solidification equation is applied with solidification parameters: variable partition ratio (k) of solute and diffusion coefficient (D), effective length of volume element (L ¼ s Á d 2 =2, s: structure factor (¼ 0:5 $ 1), d 2 : dendrite arm spacing) and local solidification time ( f ) obtained by the experiment. 10,11) …”

Microstructure and Mechanical Properties of L1<SUB>2</SUB>-(Al, Cr)<SUB>3</SUB>Ti/Ti<SUB>2</SUB>AlC Composites Prepared by Combustion Synthesis

“…systems have focused on the mechanical properties of the ternary L1 2 trialuminide compounds. [5][6][7][8][9][10][11] These potential (Al, X) 3 Ti compounds have good oxidation resistance and some ductility because the L1 2 structure has the five independent slip systems condition required for homogeneous deformation. However, the ternary L1 2 compounds are still brittle in tension and/or bending, although they exhibit appreciable compressive ductility at ambient temperature.…”