Interaction of iron-nickel alloys with liquid aluminium

Abstract

The dissolution of Fe-Ni alloys containing 90 to 5 mass % Fe in liquid aluminium at 700~ was found by the rotating-disc technique to be non-selective and diffusion controlled. Experimentally determined values of the saturation concentration (solubility), Cs, of iron and nickel from Fe-Ni alloys in the aluminium melt are presented. A dependence of the total iron and nickel concentration, Ctotal, in the saturated melt upon the iron content CFe, in initial Fe-Ni alloys could well be described by the linear equations: Ctotal = 7.51 -0.054CFe at 90% < CFe < 28% and Ctotal = 11.0 -0.19CFe at 28% < CFe < 5%. Considerable deviations of the concentration-time relationships from the Nernst-Shchukarev equation were revealed. The value of the dissolution rate constant was found to decrease by about 20 to 30%-in the 0 to Cs/2 iron or nickel concentration range. Accordingly, the decrease in value of the iron and nickel diffusion coefficient from an Fe-Ni alloy into liquid aluminium was 25 to 40%. For a 90% Fe-10% Ni alloy the value of the diffusion coefficient tends, with increasing iron and nickel concentration in the melt, to the value of the diffusion coefficient of pure iron in liquid aluminium. For other Fe-Ni alloys investigated, these values are less than or close to the diffusion coefficient of pure nickel in liquid aluminium.

Effect of annealing treatment on joint strength of aluminum/steel friction stir lap weld

“…Therefore, the separation was formed at the interface of the Al 3 Fe intermetallic layer and Al-5083 base metal. It is possible that the formation of the separation between the Al 3 Fe and Al-5083 was due to the difference of the thermal expansion coefficients between Al 3 Fe and Al-5083 (Thermal expansion coefficients are 22.9 Â 10 À6 K À1 , 11.9 Â 10 À6 K À1 and 15.2 Â 10 À6 K À1 for Al, Fe and Al 3 Fe, respectively [28]). This could cause a thermal stress accumulated at the Al/Al 3 Fe interface during the sample cooling after heating period.…”

Effect of transition metals on the interfacial reactions in electroless Ni(P)-solder interconnections

“…8). This may induce the excess dissolution of Ni according to the Nernst-Brenner equation which could be extended to describe the dissolution of intermetallics in contact with liquid solder [10]. Time at peak temperature (sec 1l2 ) Nanoindentation results of the constitutional phases at interface were listed in Table 1.…”

Interfacial reaction between solid nickel and liquid zinc

“…Layer cracking appears to be a result of the difference in thermal expansion coefficients of these phases. The coefficient of thermal expansion of zinc is 30.0×10 -6 mm -1 ·K -1 , more than two times higher than that of nickel (13.4×10 -6 mm -1 ·K -1 ) [9,10] .…”