Structure et proprietes mecaniques des alliages fer-aluminium

Mechanical properties and oxidation behaviour of two-phase iron aluminium alloys with Zr(Fe,Al)2 Laves phase or Zr(Fe,Al)12 τ1 phase

“…The yield stresses of this alloy show no obvious effect of the change in ordering and are significantly lower than for the alloy with 20at.% Al, where A2CD0 3 ordering co-exist. This drop of the yield stress with increasing Al content in the D0 3 composition range and the subsequent increase observed for the alloy with 40.5at.% are qualitatively in perfect agreement with the results reported for pure binary Fe-Al alloys [5,[40][41][42]. Besides the change of atomic ordering, possible excess thermal vacancies in the Al-rich alloy (see Section 3.2.3) and-in the present case of the ternary alloys-the change of the second phase from the Laves phase to the t 1 phase can affect the yield stress.…”

“…For binary Fe-Al alloys, the effect of strengthening by entering the two-phase A2CD0 3 region is well-known (see e.g. [40][41][42]). In Fig.…”

Concepts derived from phase diagram studies for the strengthening of Fe–Al-based alloys

“…Fig. 2 shows data compiled from the literature for the dependence of the yield stress on Al content at elevated temperatures [17][18][19][20][21]. At 100 8C there is a continuous increase of the yield stress up to an Al content of about 24 at.% Al followed by a sharp drop.…”

The stress anomaly in FeAl–Fe3Al alloys

“…The stress anomaly in FeAl is a relatively new discovery [1][2][3] and for years it was thought that this intermetallic was different from many, such as Ni 3 Al, in not showing any anomalous stress peak [4][5][6][7][8][9] on mechanical testing at intermediate temperatures. It subsequently became clear that an anomalous stress peak indeed existed [1][2][3], at temperatures in the range 400-600 8C, and a pre-requisite was that the sample material be previously well annealed to 'relax' any internal structure [10][11][12][13][14].…”