Accession Number : ADA172140


Title :   Alloy Development, Processing and Characterization of Devitrified Titanium Base Microcrystalline Alloys.


Descriptive Note : Annual rept. Sep 84-Aug 85,


Corporate Author : NORTHEASTERN UNIV BOSTON MA BARNETT INST OF CHEMICAL ANALYSIS AND MATERIALS SCIENCE


Personal Author(s) : Whang,Sung H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a172140.pdf


Report Date : Jan 1986


Pagination or Media Count : 17


Abstract : The effect of rapid solidification on solid solubility, microstructural refinement and phase transformation in binary and ternary titanium alloys was studied. The stability of the refined microstructures produced by rapid quenching were investigated under the isothermal and isochronal conditions. In particular, Ostwald ripening of rare earth (Y, La, Er) and Thorium dispersoids in Ti-Sn-X (Y, La, Er, Th) systems at elevated temperatures (700-900 C, phase) was investigated by transmission electron microscopy and image analyzer. The grain growth rate at the presence of the rare earth and Th dispersoids was investigated and determined as a function of time. The deterioration of microhardness in the ternary alloys containing rare earth dispersions upon high temperature annealing was studied in relation to microstructural coarsening. Keywords: Grain structures(Metallurgy); Binary alloys; Titanium alloys; Microstructure; Arc melt spinning; Ostwald ripening of rare earth dispersoids, Age hardening; Alpha Titanium alloys, High temperature alloys.


Descriptors :   *MICROSTRUCTURE , *PHASE TRANSFORMATIONS , *SOLUBILITY , *TITANIUM ALLOYS , ANNEALING , STABILITY , QUICK REACTION , TIME DEPENDENCE , HIGH TEMPERATURE , SOLIDIFICATION , ALLOYS , QUENCHING , IMAGES , ANALYZERS , TERNARY COMPOUNDS , RARE EARTH ELEMENTS , DETERIORATION , GRAIN STRUCTURES(METALLURGY) , ISOTHERMS , BINARY ALLOYS , INTERVALS , MICROHARDNESS , HEAT RESISTANT ALLOYS , ARC MELTING


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE