Ductile fracture of mechanically alloyed iron-yttria alloys. [Fe-1 yttria; Fe-2 yttria; Fe-4 yttria; Fe-10 yttria]

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

DOI:https://doi.org/10.1007/BF02656636· OSTI ID:6310914

Kosco, J B ^[1]; Koss, D A ^[2]

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1. Hoeganaes Corp., Riverton, NJ (United States)
2. Pennsylvania State Univ., University Park (United States)

The influence of Y[sub 2]O[sub 3] particle content on the tensile fracture of mechanically alloyed iron has been studied for a series of dispersion-strengthened alloys containing up to 10 vol pct particles. When compared to the behavior of spheroidized steels, the present results indicate that at comparable volume fractions of particles, the Fe-Y[sub 2]0[sub 3] alloys exhibit a much decreased tensile ductility. Observations of microscopic damage indicate that this is a consequence of rapid void nucleation at small strains, limited void growth, and enhanced void linking, especially at high particle contents. Analysis of these observations suggests (a) a surprisingly high oxide particle-matrix interfacial bond strength, (b) an influence of rapid strain hardening at small strains in creating high flow stresses, which assist void initiation, (c) enhanced void nucleation at high volume fractions of particles due to neighboring particles and voids, and (d) an accelerated void-linking process at high volume fractions of particles when interparticle spacing approaches particle/ void size.

• OSTI ID: 6310914
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Vol. 24:3; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON BASE ALLOYS
FRACTURE PROPERTIES
YTTRIUM OXIDES
ANNEALING
DUCTILITY
EXPERIMENTAL DATA
HOT WORKING
INTERFACES
MECHANICAL TESTS
MICROSTRUCTURE
MILLING
OPTICAL MICROSCOPY
PRESSING
SCANNING ELECTRON MICROSCOPY
STRAIN HARDENING
TENSILE PROPERTIES
VOIDS
ALLOYS
CHALCOGENIDES
DATA
ELECTRON MICROSCOPY
FABRICATION
HARDENING
HEAT TREATMENTS
INFORMATION
IRON ALLOYS
MACHINING
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360103* - Metals & Alloys- Mechanical Properties