Structure and properties of cast Al–Si based alloy with Zr–V–Ti additions and its evaluation of high temperature performance

Effect of Zr, V and Ti on hot compression behavior of the Al–Si cast alloy for powertrain applications

“…The stationary dislocations in a solid solution could be pinned by the solute atoms if they are able to diffuse to the dislocation core so an additional increment of stress will be required to free the dislocation from its energetically favorable position. Further, as stated in [16,18], the Al-Si-Mg-Cu alloys modified with Ti, Zr and V contain thermally stable fine precipitates of Al 3 X (X = Ti, V and Zr), which during hot deformation exerted more strengthening effect compared to the base alloy, resulting in higher deformation activation energy of the modified alloy in this study. That is to say that the energy barrier in the modified alloy is higher than in the base alloy, which causes the reduction of the ability to diffuse atoms and migrate the grain boundary, thus accelerating the dynamic recrystallization in the modified alloy.…”

“…Details of the alloy preparation were explained in Ref. [16,18,34]. As-cast alloys were then subjected to T6 heat treatment, consisting of two-step solution treatment at 505°C for 0.5 h and at 525°C for 4.5 h, followed by water quenching and artificial aging at 150°C for 100 h [17].…”

“…7 and 8. An example of particle chemistry determined by SEM/EDX is shown in Table 4 but detailed characterization of precipitates in both alloys is published separately [18,35]. In this Table 3 The calculated Zener-Hollomon parameter of the base and modified alloys at different strain rates and corresponding temperatures (DRV -dynamic recovery; DDRXdiscontinuous dynamic recrystallization; CDRX -continuous dynamic recrystallization).…”

“…The properties of Al-Si alloys were modified by introducing Fe, Ni, Cr transition metals [12][13][14][15]. Compared to other transition metals, Ti, V and Zr have low diffusivity and solubility in Al, and form thermally stable intermetallics that are promising in maintaining high strength at temperatures up to 350°C [16][17][18][19][20]. In recent studies, Mohamed et al [21,22] showed that additions of Ti, Zr and Ni in the Al-Si-Cu-Mg alloy could improve their high temperature strength.…”

“…There is also no assessment of the behavior of complex intermetallic phases, formed in Al based alloys modified with the addition of Ti, V and Zr [16,[30][31][32][33]. Besides the influence of simultaneous additions of Ti, V and Zr, it is of interest to assess the individual role of each element in this triple combination [18,34].…”