Metallography of a pulsed Nd:YAG laser weld in a RS/PM Al-8Fe-2Mo alloy

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Materials Characterization; (USA)

DOI:https://doi.org/10.1016/1044-5803(90)90041-H· OSTI ID:6625359

Krishnaswamy, S; Baeslack, III, W A ^[1]

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1. Ohio State Univ., Columbus, OH (USA). Dept. of Welding Engineering

This paper reports the microstructure of a pulsed Nd:YAG laser weld in a rapid solidification/powder metallurgy (RS/PM) Al-8.0 wt.% Fe-2.3 wt.% Mo (Al-8Fe-2Mo) alloy investigated using light microcopy, canning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. This analysis revealed significant microstructure variations across the weld fusion zone (FZ). Near the fusion boundary, a light-etching FZ microstructure was observed to contain submicron dispersoids entrapped in a matrix of fine-sized dendritic alpha aluminum. At the center of the FZ, the presence of relatively coarse-sized intermetallic particles that served as growth centers for coarser dendritic alpha aluminum promoted a dark-etching microstructure. In the boundary between successive melt zones, both a heat-affected zone (HAZ) containing acicular dispersoids and a fusion boundary region (FBR) containing irregular-shaped particles in a coarse-grained dendritic alpha aluminum matrix were observed.

• OSTI ID: 6625359
• Journal Information: Materials Characterization; (USA), Journal Name: Materials Characterization; (USA) Vol. 24:4; ISSN 1044-5803; ISSN MACHE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ALUMINIUM ALLOYS
CHEMISTRY
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ETCHING
FABRICATION
JOINING
KNOOP HARDNESS
LASER WELDING
LASERS
METALLOGRAPHY
METALLURGY
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NEODYMIUM LASERS
PHOTOCHEMISTRY
POWDER METALLURGY
SCANNING ELECTRON MICROSCOPY
SOLID STATE LASERS
SURFACE FINISHING
TRANSMISSION ELECTRON MICROSCOPY
WELDING