Plessite formation by discontinuous precipitation reaction from γ-Fe,Ni in Richardton (H5) ordinary chondrite

Nature ◽  
1983 ◽  
Vol 301 (5898) ◽  
pp. 322-324 ◽  
Author(s):  
V. J. Grokhovsky ◽  
A. W. R. Bevan
Keyword(s):  
Discontinuous Precipitation ◽  
Ordinary Chondrite ◽  
Precipitation Reaction ◽  
Discontinuous Precipitation Reaction

Phase Transformations and Ageing Phenomena in Copper-Nickel-Manganese Alloys

1982 ◽  
Vol 21 ◽  
Author(s):  
A.E. Weatherill ◽  
R.A. Buckley
Keyword(s):  
Grain Boundaries ◽  
Discontinuous Precipitation ◽  
Alloy System ◽  
Precipitation Reaction ◽  
Heterogeneous Precipitation ◽  
Manganese Alloys ◽  
Discontinuous Precipitation Reaction ◽  
The Subject ◽  
Binary Alloy System ◽  
Nickel Manganese

The pseudo-binary alloy system extending between copper and the intermetallic NiMn was first shown by Dean et al. [1,2] to yield a series of age hardenable alloys. The alloy containing 20% each of Ni and Mn has the best combination of strength and toughness and has been the subject of more recent studies [3,4]. The phase transformation associated with ageing in quenched Cu-NiMn alloys is precipitation of the ordered tetragonal (Llo) phase, (⊖) based on NiMn, from an fcc solid solution. Generally three modes of transformation occur depending on composition and temperature. An intragranular precipitate of fine coherent particles of ⊖, or a cellular or discontinuous precipitation reaction emanating from the grain boundaries, or heterogeneous precipitation of ⊖ at the grain boundaries.

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