Microstructures and mechanical properties of dispersion-strengthened high-temperature Al-8. 5Fe-1. 2V-1. 7Si alloys produced by atomized melt deposition process

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02656507· OSTI ID:6520304

Hariprasad, S; Sastry, S M.L.; Jerina, K L ^[1]; Lederich, R J ^[2]

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1. Washington Univ., St. Louis, MO (United States)
2. McDonnell Douglas Research Labs., St. Louis, MO (United States)

Dispersion-strengthened high-temperature Al-8.5% FeSiV alloys were produced by atomized melt deposition (AMD) process. The effects of process parameters on the evolution of microstructures were determined using optical metallography and scanning and transmission electron microscopy. The extent of undercooling and the rate of droplet solidification wee correlated with process parameters, such as melt superheat, metal/gas flow rates, and melt stream diameter. The size distribution and morphology of silicide dispersoids were used to estimate the degree of undercooling and the cooling rate as functions of process parameters. The tensile properties at 25C to 425C and fracture toughness at 25C of these alloys produced with wide variations in dispersoids size and grain size were determined. Under optimum conditions, the alloy has ultimate tensile strength of 281 MPa and 9.5% ductility in the as-deposited condition. Upon hot-isostatic pressing and extrusion, the ultimate tensile strength increased to 313 MPa and ductility increased to 18%.

• OSTI ID: 6520304
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 24A:4; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
IRON ALLOYS
SILICON ALLOYS
VANADIUM ALLOYS
CHEMICAL VAPOR DEPOSITION
CORRELATIONS
DUCTILITY
EXTRUSION
FRACTURE PROPERTIES
GRAIN SIZE
HOT WORKING
METALLOGRAPHY
MORPHOLOGY
SCANNING ELECTRON MICROSCOPY
SOLIDIFICATION
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL COATING
CRYSTAL STRUCTURE
DEPOSITION
ELECTRON MICROSCOPY
FABRICATION
MATERIALS WORKING
MICROSCOPY
PHASE TRANSFORMATIONS
SIZE
SURFACE COATING
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties