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In present work, we systematically study the $\alpha$ decay half-lives of 170even-even nuclei with $60 \leqslant Z \leqslant 118$ within the two-potentialapproach while the $\alpha$ decay preformation factor $P_\alpha$ is obtained bythe cluster-formation model. The calculated results can well reproduce theexperimental data. In addition, we extend this model to predict the $\alpha$decay half-lives of 64 even-even nuclei with $104 \leqslant Z \leqslant 128$whose $\alpha$ decay is energetically allowed or observed but not yetquantified. For comparing, the two famous models i.e. SemFIS proposed by D.Poenaru ${et\ al.}$ [\href{https://doi.org/10.1209/0295-5075/77/62001}{Europhys. Lett. \textbf{77} (2007)62001}] and UDL proposed by C. Qi ${et\ al.}$ [\href{https://doi.org/10.1103/PhysRevLett.103.072501}{Phys. Rev. Lett. \textbf{103}(2009) 072501}] are used. The predicted results of these models are basicallyconsistent. At the same time, through analyzing the changing trend of $\alpha$decay energy $Q_{\alpha}$ of \emph{Z} = 118, 120, 122, 124, 126 and 128isotopes nuclei with the increasing of neutron number \emph{N} and that of$\alpha$ decay preformation factor $P_\alpha$ of those isotopes even-evennuclei with the increasing of neutron number \emph{N}, \emph{N} = 178 may be anew neutron magic number.

Predictions of $\alpha$ decay half-lives for even-even superheavy nuclei  with $104 \leqslant Z \leqslant 128$ based on two-potential approach within  cluster-formation model