Combined ab initio and experimental study of structural and elastic properties of Fe3Al-based ternaries

Nanoprecipitation of oxide particles and related high strength in oxide-dispersion-strengthened iron–aluminium–chromium intermetallics

“…The Young's moduli of the present materials have been determined at room temperature by nanoindentation methods (see Ref. [37] for details) and the values obtained, consistent with the other information available [37,46,47], are shown in Tables 1-4. For the present materials the stiffening effect of Cr is close to 2% increase per %Cr addition.…”

“…Information on the temperature dependence of Young's modulus of binary Fe-Al alloys, as well as the strong composition dependence, is available [46]. Equally, it is known that Cr additions lead to strong increases in modulus [37,47], ranging between 2-4% increase in modulus per%Cr addition. This information, together with the microstructural parameters, given in Tables 1-4, has been used to analyse the observed material strengths and their temperature dependence.…”

A Review on the Properties of Iron Aluminide Intermetallics

“…Some possible explanations for the observed irregularities including other long-range ordered states, short-range ordering, two-phase structure, material impurities such as carbide precipitation and quenched-in vacancies are proposed [35,[37][38][39]. The different phases and their lattice structure and lattice parameters are listed in Table 1 [9,[40][41][42][43][44][45][46]. Figure 4 [47] shows the extension of the solid solution of Al in Fe from 0 up to 45 at.…”

“…Some metallic elements such as Si, V, Cr, Mn, Co, Ni, Cu and Zn have large solid solubility [37,82,83] and others such as Zr, Nb and Ta have restricted solid solubility in Fe-Al intermetallics [83,84]. It has been shown that the β sublattice sites are preferred by Ti, W, V, Cr, Mo and Zr whereas Si atoms prefer the γ sublattice in a Fe3Al super-structure [40,85]. The effect of different ternary alloying elements on the formation energies (E f ), relative changes of lattice parameters and Young's modulus were determined using experimental approaches as well as computer simulations (see Table 4) [40,[86][87][88].…”

“…It has been shown that the β sublattice sites are preferred by Ti, W, V, Cr, Mo and Zr whereas Si atoms prefer the γ sublattice in a Fe3Al super-structure [40,85]. The effect of different ternary alloying elements on the formation energies (E f ), relative changes of lattice parameters and Young's modulus were determined using experimental approaches as well as computer simulations (see Table 4) [40,[86][87][88].…”