A buried amorphous Ni-Si layer inside a crystalline Ni substrate has b
een produced by channeled Si implantation and observed using high dept
h resolution Rutherford backscattering and channeling as well as trans
mission electron microscopy. The buried amorphous layer is in the dept
h region where the Si concentration is > 30 at%. The significance of t
his observation on the mechanisms of ion-implantation-induced amorphiz
ation of metals is discussed.