The effects of chromium on the microstructure and tensile behavior of Fe30Ni20Mn35Al15

a b s t r a c tThe microstructure and mechanical properties studies of a series of two-phase f.c.c./B2 (ordered b.c.c.) lamellar-structured, high entropy alloys (HEA) Fe 36 Ni 18 Mn 33 Al 13 Ti x with x up to 6 at. % Ti have been investigated. X-ray microanalysis in a TEM showed that the Ti resided mostly in the B2 phase. The lamellar spacing decreased significantly with increasing Ti content from 1.56 mm for the undoped alloy to 155 nm with an addition of 4 at. % Ti, leading to a sharp increase in room-temperature yield strength,s y , from 270 MPa to 953 MPa, but with a concomitant decrease in ductility from 22% elongation to 2.3%. Annealing at 1173 K for 20 h greatly increased the lamellar spacing of Fe 36 Ni 18 Mn 33 Al 13 Ti 4 to 577 nm, producing a corresponding decrease in s y to 511 MPa. The yield strengths of all the doped alloys decreased significantly when tensile tested at 973 K with a concomitant increase in ductility due to softening of the B2 phase. The fracture mode changed from cleavage at room temperature to a ductile dimple-type rupture at 973 K. The results are discussed in terms of the Hall-Petch-type relationship.

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“…phase [15]. Chromium additions slightly lower the yield strength but increase the ductility with little change in the microstructure.…”

Section: Microstructure Evolutionmentioning

confidence: 93%

“…% Cr was investigated by Meng et al [14,15] who found that the Cr alleviates the environmental embrittlement due to the formation of protective chromia-containing oxide scales on the surface. Cr additions up to 6 at.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti content on the microstructure and mechanical behavior of (Fe36Ni18Mn33Al13)100−xTix high entropy alloys

Wang

Cai

et al. 2016

Intermetallics

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“…Previous work has shown that initial plastic deformation at room temperature occurs only in the f.c.c. phase in lamellar-structured f.c.c./B2 FeNiMnAlCr alloys [12]. However, since there is no cracking evident, plastic deformation must have also occurred in the B2 phase.…”

Section: A N U S C R I P Tmentioning

confidence: 98%

“…The grain sizes of the two phases are ~0.5 µm. Figure 6 Table 2 shows the average results from three tensile tests of both the cold-rolled material and the recrystallized material; previously determined values for the as-cast material are shown for comparison [12]. The cold-rolled Fe 28 (Figure 9b).…”

Section: A N U S C R I P Tmentioning

confidence: 99%