There are many Zr particles in as-cast NiAl-33.5Cr-0.5Zr (at. pct) alloy, which usually exist at the edge of eutectic of β-NiAl and α-Cr. After air and furnace cooling solution treatments, for 14000C, 2 h and 1450℃...There are many Zr particles in as-cast NiAl-33.5Cr-0.5Zr (at. pct) alloy, which usually exist at the edge of eutectic of β-NiAl and α-Cr. After air and furnace cooling solution treatments, for 14000C, 2 h and 1450℃, 1 h, pure Zr phase remains in the furnace cooling (F.C.) state alloys and Ni2AlZr phase forms in the air cooling (AC.) state alloys. During solution treatment at 14500C, bulk and "fish bone"shape Zr-rich phases form respectively in F.C. and AC. state alloys. A ’river’?shape Ni2AlZr phase forms after 14500C for lh F.C. and 8500C for 12 h, F.C.. The alloy has less pure Zr and Ni2AlZr phase after 14000C with both air and furnace cooling followed by 8500C and 9500C for 12 h, F.C. aging treatments, respectively. Additionally, there is a ternary eutectic of NiAIZr and a phase enriched Zr and Cr forms at the edge of the eutectic of β-NiAl and α-Cr in the alloy treated at 14000C, 2 h, F.C. and 9500C, 12 h, F.C.展开更多
基金The work was supported by the National Advanced Materials Connittee of China(Grant No.970321016)the National Natural Science Foundation of Chind(No.59895152).
文摘There are many Zr particles in as-cast NiAl-33.5Cr-0.5Zr (at. pct) alloy, which usually exist at the edge of eutectic of β-NiAl and α-Cr. After air and furnace cooling solution treatments, for 14000C, 2 h and 1450℃, 1 h, pure Zr phase remains in the furnace cooling (F.C.) state alloys and Ni2AlZr phase forms in the air cooling (AC.) state alloys. During solution treatment at 14500C, bulk and "fish bone"shape Zr-rich phases form respectively in F.C. and AC. state alloys. A ’river’?shape Ni2AlZr phase forms after 14500C for lh F.C. and 8500C for 12 h, F.C.. The alloy has less pure Zr and Ni2AlZr phase after 14000C with both air and furnace cooling followed by 8500C and 9500C for 12 h, F.C. aging treatments, respectively. Additionally, there is a ternary eutectic of NiAIZr and a phase enriched Zr and Cr forms at the edge of the eutectic of β-NiAl and α-Cr in the alloy treated at 14000C, 2 h, F.C. and 9500C, 12 h, F.C.
