MA법으로 제조된 Ni기합금에서 Y₂O₃ 첨가에 따른 인장강도변화와 시효처리효과
Variation of Tensile Strength by Addition of Y₂O₃ and Effect of Aging Treatment in Ni Base Alloy Fabricated by MA Method
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Ni-20Cr-20Fe-5Nb alloy with or without Y₂O₃ was manufactured by mechanical alloying processand consolidated by spark plasma sintering (SPS). The grain size of the alloy with Y₂O₃ was smaller than that ofalloy without Y₂O₃, which results from the effect of Y₂O₃ temperature was increased by the addition of Y₂O₃but decreased abruptly at temperature above 600℃. It seems toresult from the change of deformation mechanism due to fine grain size, that is, grain boundary sliding is pre-dominant at above 600℃ while internal dislocation movement is predominant at below 600℃. After conventionalheat treatment process of solution treatment and aging, a small amount of δ(Ni₃Nb) phase was formed in Ni-20Cr-20Fe-5Nb alloy while a large amount of γ'' (Ni₃Nb) was formed in Inconel 718 in the previous report. This is due
Abstract
Ni-20Cr-20Fe-5Nb alloy with or without Y₂O₃ was manufactured by mechanical alloying processand consolidated by spark plasma sintering (SPS). The grain size of the alloy with Y₂O₃ was smaller than that ofalloy without Y₂O₃, which results from the effect of Y₂O₃ temperature was increased by the addition of Y₂O₃but decreased abruptly at temperature above 600℃. It seems toresult from the change of deformation mechanism due to fine grain size, that is, grain boundary sliding is pre-dominant at above 600℃ while internal dislocation movement is predominant at below 600℃. After conventionalheat treatment process of solution treatment and aging, a small amount of δ(Ni₃Nb) phase was formed in Ni-20Cr-20Fe-5Nb alloy while a large amount of γ'' (Ni₃Nb) was formed in Inconel 718 in the previous report. This is due
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