Effects of boron content on environmental embrittlement of ordered Ni3Fe alloys
Tóm tắt
The effects of boron content (CB = 0–0.14% (mass fraction)) on the tensile properties and environmental embrittlement of ordered Ni-24%Fe (atom fraction)-B (Ni3Fe-B) alloys have been investigated using tensile tests in vacuum and under gaseous hydrogen. The results indicate that, when CB < 0.06% (mass fraction), the tensile strength and elongation of the alloys in vacuum and gaseous hydrogen increase as CB in the ordered Ni3Fe-B alloy increases. The tensile strength and elongation are maximum, and the hydrogen embrittlement factor (IH) is minimum for the ordered Ni3Fe-0.06%B (mass fraction) alloy. Compared with the ordered B-free Ni3Fe alloy, IH of the ordered Ni3Fe-0.06%B (mass fraction) alloy decreases by 98.1%, and the fracture morphology of the alloy changes from fully intergranular to fully transgranular, when tested in gaseous hydrogen. A critical level of boron segregation at the grain boundaries of ordered Ni3Fe-B alloys is observed. The hydrogen embrittlement of ordered Ni3Fe-B alloys in gaseous hydrogen can be completely suppressed by boron atoms when CB
$$\geqslant$$
0.06% (mass fraction).
Tài liệu tham khảo
Tao ZX (1990) Main properties and toughening methods of high technology structural materials for intermetallic compounds. Shanghai Steel Iron Res 6:51–58
Stoloff NS, Liu CT, Deevi SC (2000) Emerging applications of intermetallics. Intermetallics 8:1313–1320
Wan XJ, Chen YX, Cheng XY (2001) Advances in research on environmental hydrogen embrittlement of intermetallic compounds. Prog Nat Sci 11(5):458–464
Wan XJ, Cheng XY, Chen YX et al (2001) Embrittlement of intermetallics in gaseous hydrogen. Prog Nat Sci 11(12):1233–1239
Camus GM, Stoloff NS, Duquette DJ (1989) The effect of ordering on the hydrogen embrittlement of Ni3Fe. Acta Metall 37(5):1497–1501
Aoki A, Izumi O (1979) Improvement in room temperature ductility of the L12 type intermetallic Ni3Al by boron addition. Nippon Kinzoku Grakkaishi 43:1190–1199
Ma J, Chen YX, Liu CT (2009) Effect of boron on the environmental embrittlement of ordered Ni3Fe alloys in gaseous hydrogen. J Nanjing Univ 45(2):241–247
Wan XJ, Chen YX, Shi DD et al (2008) Effect of alloy stoichiometry and boron doping on the H2-induced environmental embrittlement of Ni3Fe intermetallics. Intermetallics 16:550–553
Chen YX, Ma J (2012) Mechanism of boron suppressing environmental embrittlement in H2 for the ordered Ni3Fe intermetallics. Procedia Eng 27:1121–1128
Liu Y, Liu CT, Heatherly L et al (2011) Effect of boron on the fracture behavior and grain boundary chemistry of Ni3Fe. Scr Mater 64(3):303–306
Chen YX (2011) Environmental hydrogen embrittlement of intermetallics. J Shanghai Univ (Nat Sci) 17(4):487–502
Ma J (2008) Effect of boron on the environmental embrittlement of ordered Ni3Fe alloys in gaseous hydrogen. Dissertation, Shanghai University
Takasugi T, Hanada S (1994) The influence of constituent elements and atomic ordering on hydrogen embrittlement of Ni3Fe polycrystals. Intermetallics 2:225–232
Lee KH, Lukowski JT, White CL (1997) Effects of gaseous hydrogen and water vapor pressure on environmental embrittlement of Ni3Al. Intermetallics 5:483–490
Wan XJ, Zhu JH, Jing KL (1992) Hydrogen effect on the deformation and fracture behaviors of a Ni3Al+B alloy. Scr Metall Mater 26:479–484
Li J, Xie YP, Chen YX et al (2014) First-principles study of the hydrogen adsorption and diffusion on ordered Ni3Fe(111) surface and in the bulk. Intermetallics 44:64–72
Chen YX, Ma J, Liu CT (2011) Hydrogen diffusivity in B-doped and B-free ordered Ni3Fe alloys. Intermetallics 19:105–108
Yang B, Chen YX, Li SL (2018) Effect of B content on environmental embrittlement of ordered (Fe, Co)3V alloys. Rare Metal Mater Eng 3:976–981
Wan XJ, Zhu JH, Jing KL (1992) Environmental embrittlement in Ni3Al+B. Scr Metall Mater 26:473–477