Second Phase Precipitation within a Laves Phase in the Ir-Y Binary System

Nobuaki Sekido; Yoko Yamabe-Mitarai

doi:10.4028/www.scientific.net/MSF.638-642.1400

Paper Titles

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Non-Destructive Fluorine Depth Profiling as Quality Assurance for the Oxidation Protection of TiAl Turbine Blades
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Preparation of Homogeneous Nb-Al Intermetallic Compound Sheet by Multi-Layered Rolling and Subsequent Heat Treatment
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Microstructure Formation in Cast β-Solidifying γ-Titanium Aluminide Alloys
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Second Phase Precipitation within a Laves Phase in the Ir-Y Binary System
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The Effects of Heat Treatments and Tungsten Additions on Microstructures and Tensile Properties of Powder Metallurgy Ti-48Al-2Nb-2Cr
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Crystal Growth and Characterization of FeAs-Based Superconductors
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Study of Refined Microstructures after Two-Step Heat Treatments by Means of EBSD Technique on γ-TiAl Alloys
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An Investigation of Fracture Origins in Heat-Treated Ti₄₉Al₄₇Cr₂Nb₂ Powder Compacts
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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Second Phase Precipitation within a Laves Phase in...

Second Phase Precipitation within a Laves Phase in the Ir-Y Binary System

Abstract:

A Laves phase Ir2Y is found to exhibit a temperature dependent solubility, which yields Ir3Y precipitation within the Ir2Y matrix of an arc-melted Ir-30at.%Y alloy. Microstructure observations have confirmed that the precipitation of Ir3Y has already started in the as-cast state. Upon annealing of an as-cast Ir-30at.%Y, the volume fraction of Ir3Y precipitates increases and finally reaches about 50%. The orientation relationship between Ir3Y and Ir2Y has been identified as: (0001)Ir3Y//(111)Ir2Y and [21 _ 1 _ 0]Ir3Y//[1 _ 10]Ir2Y. The orientation relationship is rationalized by the atom matching at the habit plane between the two phases.