Effect of B and Cr on Mechanical Properties and Magnetostriction of Iron-Gallium Alloy

Abstract

Effects of B and Cr additions on magnetostriction and the mechanical properties of polycrystalline Fe 83 Ga 17 alloy were investigated. Small addition of B increased magnetostriction of Fe 83 Ga 17 alloy slightly, and improved the room temperature ductility and tensile strength significantly. The elongation and tensile strength of the (Fe 83 Ga 17 ) 99 B 1 alloy increased to 3.56% and 548 MPa compared with that of Fe 83 Ga 17 alloy respectively. The Cr addition was shown to improve the room temperature mechanical properties of Fe 83 Ga 17 alloy beneficially. The maximum magnetostriction of (Fe 83 Ga 17 ) 98 Cr 2 alloy was 70 Â 10 À6 . The influences of B and Cr additions on the fracture mode of Fe 83 Ga 17 alloy were also studied in this paper.

Retaining the ⟨001⟩ Orientation from Initial Columnar Grains and Magnetostriction in Binary Fe-Ga Alloy Sheets

“…Directional solidification can decrease the density of transversal grain boundary, which could work as a method for improving the mechanical property of these alloys. As reported in previous studies, 19,20) the tensile strength of the equiaxed-grained FeGa (1518 at%) alloy without preferred orientation was about 380³450 MPa at room temperature, and the fracture mode was intergranular fracture. It is considered that the tensile strength depends on the grain boundary bonding strength.…”

Pseudoelasticity in Fe3Ga with boron-A combined atomistic–micromechanical treatment

“…6). Nonetheless, we will limit our analysis to octahedral interstitial to be consistent with the earlier experimental works (Gao et al, 2009), and the energy results reported in Table 1. It should be noted that the boron solutes for the case of octahedral sites are pushed further into the improper sites which lie along the close packed directions (hereafter, we refer these improper sites as the "xenohedral" sites, and will be discussed later).…”

“…Pseudoelasticity is a consequence of reversible pseudotwinning, a form of twinning in ordered alloys, and reversible slip. Alloying of FeeGa crystals with boron has proven beneficial for improving the ductility and flow stress (Gao et al, 2009). In this paper, we explore the elevation in critical twinning stress in the D0 3 ordered Fe 3 Ga crystals with boron with atomisticemicromechanical treatments.…”

Ductility enhancement and magnetostriction of polycrystalline Fe–Ga based alloys

“…3a). But the Fe 2 B phase was not identified duo to low content [17]. A farthing of B could enter interstitially into the octahedral site as in pure ␣-Fe as discussed by Clark [12] and Huang [19].…”

“…The increase of grain boundaries area leaded to an increase of resistance to crack propagation. Therefore, B improved the ductility and strength of the Fe-Ga alloy [17]. Liu et al [18] have pointed out that the beneficial effect of Cr on ductility of the Fe 3 Al alloy was attributed to the easy cross-slip behavior of dislocations and solution softening.…”