Nonequilibrium solidification and microstructures of metal phases in the shock-induced melt of the Yanzhuang (H6) chondrite

Computer Science

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

4

Chondrites, Dendritic Crystals, Meteoritic Microstructures, Nonequilibrium Conditions, Phase Transformations, Shock Heating, Solidification, Troilite, Nickel, Petrography

Scientific paper

Dendrites in the metal-troilite spherules in both shock-induced melt veins and a melt pocket of the Yanzhuang chondrite show zoning in their microstructures. This feature is indicative of nonequilibrium solidification of the metal phases. Dendrites in the melt pocket have a typical crust-core structure consisting of martensitic interiors (7.5 - 8.1 wt% Ni) and Ni-rich rims (12.5 - 23.3 wt% Ni). In comparison, the dendrites in melt veins have three microstructural areas: (1) core (6.4 - 7.3 wt% Ni); (2) martensite between the core and rim (7.4 - 8.5 wt% Ni); (3) Ni-rich rim (12.8 - 21.4 wt% Ni). It is suggested that the difference in cooling rates followed shock-induced high temperature melting might be an important factor in producing the different dendritic microstructures in melt veins and melt pocket. Cooling rates deduced from measurements of secondary dendritic arm spacings are 100 - 400 C/s in the melt veins and 6 - 30 C/s in the melt pocket, respectively, and lie in the temperature interval 950 to 1400 C.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Nonequilibrium solidification and microstructures of metal phases in the shock-induced melt of the Yanzhuang (H6) chondrite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nonequilibrium solidification and microstructures of metal phases in the shock-induced melt of the Yanzhuang (H6) chondrite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonequilibrium solidification and microstructures of metal phases in the shock-induced melt of the Yanzhuang (H6) chondrite will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-836345

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.