발간논문

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Vol.27, No.3, 285 ~ 297, 1989
Title
Microstructure and mechanical Properties of Dispersion Strengthened Ni - Cr - Y2O3 Alloys by Mechanical Alloying
민우식Woo Sig Min, 김동훈Tong Hoon Kim
Abstract
Mechanical alloying was carried out on the mixed Ni-Cr-Y₂O₃powders using high energy ball mill in order to develope a dispersion strengthened Ni base superalloy. The process can be broken down into five stages (1) Initial stage (2) Stage of welding predominace (3) Stage of equiaxed particle formation (4) Start of random welding orientation (5) Steady state processing. The extruded materials of this mechanical1y alloyed powders showed a finer recrystallized structure(about 0.l㎛ grain size). The high temperature strength of dispersion strengthened materials is limited by grain boundary sliding and transverse boundary rupture. These effects are minimized by developing coarse, elongated grain structure. This structure was gained by heat treatment above a critical temperature, or 1300 C for Ni-20Cr and 1340 C for Ni-20Cr-1Y₂O₃. Ultimate tensile strength was extensively increased by adding Y₂O₃ at room temperature and developing a coarse, elongated grain at high temperature.
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