Precipitation Behavior of γ" in Severely Plastic Deformed Ni-Base Alloys

Il Ho Kim; S.I. Kwun

doi:10.4028/www.scientific.net/MSF.534-536.213

Paper Titles

Mechanical Milling of Lithium with Metal Oxide and its Reactivity with Gases
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Mechanochemical Synthesis of Zinc Ferrite, ZnFe₂O₄
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Mg-Y-Cu Bulk Metallic Glass Obtained by Mechanical Alloying and Powder Consolidation
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Nanocrystalline and Ultrafine Grained Materials by Mechanical Alloying
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Precipitation Behavior of γ" in Severely Plastic Deformed Ni-Base Alloys
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Sintering Behavior of TiC-Fe Based Composite Fabricated by Spark Plasma Sintering Using TiH₂ Graphite Powders
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Solid-State Synthesis of Mg₂X (X=Si, Ge, Sn and Pb) via Bulk Mechanical Alloying
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Synthesis of Titanium Carbide by Heat Treatment of TiH₂ and Carbon Black Powders
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The Magnetic and Photo-Catalytic Properties of Fe Doped TiO₂ Nanocrystalline Powder Synthesized by Mechanical Alloying
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HomeMaterials Science ForumMaterials Science Forum Vols. 534-536Precipitation Behavior of γ" in Severely Plastic...

Precipitation Behavior of γ" in Severely Plastic Deformed Ni-Base Alloys

Abstract:

The precipitation behaviors of γ″(Ni3Nb) in four Ni-base alloys were investigated. The four alloys were forged Ni20Cr20Fe5Nb alloy, mechanically alloyed Ni20Cr20Fe5Nb alloy, IN 718 alloy and ECAPed(equal channel angular pressing) IN 718 alloy. Aging treatment was employed at either 600°C or 720°C for 20 hrs. The TEM observation and hardness test were performed to identify the formation of γ″. The precipitation of γ″ was noticed after aging at 600°C for 20 hrs in the mechanically alloyed Ni20Cr20Fe5Nb alloy and ECAPed IN 718 alloy, while it was observed after aging at 720°C for 20 hrs in the forged Ni20Cr20Fe5Nb alloy and IN 718 alloy before ECAP. It seemed that the lower aging temperature for γ″ precipitation in the mechanically alloyed Ni20Cr20Fe5Nb alloy and ECAPed IN 718 alloy than in the forged Ni20Cr20Fe5Nb alloy and IN 718 alloy before ECAP appeared to be due to the severe plastic deformation which occurred during mechanical alloying or ECAP.