Partition of tungsten in the matrix phase for liquid phase sintered 93%W-4.9%Ni-2.1%Fe

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00492-0· OSTI ID:186780

Chiou, Y H; Zu, Y S; Lin, S T ^[1]

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1. National Taiwan Inst. of Tech., Taipei (Taiwan, Province of China). Mechanical Engineering Dept.

Solution-reprecipitation of tungsten atoms in the matrix phase during the sintering of two phase tungsten heavy alloys has been widely recognized as a diffusion-controlled process, based on correlating grain size with mathematical model. Nevertheless, considering the relatively large diffusivity of tungsten atoms in the liquid matrix phase ({approx} 10{sup {minus}9} m{sup 2}/s) and the short intergranular distance between tungsten grains ({approx} 10{sup {minus}6} m), the process time for reaching a steady state is estimated o be about 10{sup {minus}3} s, by applying the relationship of t = X{sup 2}/D. The time scale thus estimated is much smaller than that encountered in sintering. Therefore, a different mechanism possibly exists. This study aims to present a different viewpoint regarding the growth kinetics of tungsten grains by investigating the partition behavior of tungsten atoms in the matrix phase.

• OSTI ID: 186780
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 1 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRON MICROPROBE ANALYSIS
GRAIN GROWTH
HYDROGEN
IRON
KINETICS
MATRIX MATERIALS
MICROSTRUCTURE
NICKEL
OPTICAL MICROSCOPY
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
SINTERING
TUNGSTEN ALLOYS
X-RAY DIFFRACTION