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subgrain
subgrain n.
Brit. 
/ˈsʌbɡreɪn/
, /ˈsʌbɡreɪn/U.S. /ˈsəbˌɡreɪn/
Materials Science a part of a grain (grain n.1 7e) having an orientation differing slightly from that of adjacent portions of the same grain./ˈsəbˌɡreɪn/ΘΚΠ
the world > matter > constitution of matter > other specific kinds of texture > [noun] > grain of wood, stone, or metal > small, within another grain
subgrain1913
1913 O. W. Storey Microsc. Study Electrolytic Iron (Thesis, Univ. of Wisconsin) 12 These sub-grains will be called ‘inner grains’ in this thesis.
1955 Philos. Mag. 46 1343 Recent work..has shown that many of the dislocations left inside a metal after deformation are arranged along surfaces forming low angle boundaries between neighbouring regions of crystal, these latter being called subgrains, cells, or particles.
1975 Nature 10 Apr. 489/1 Granular xenoliths..show various strain effects, including undulose extinction.., slip-planes, and subgrain development.
2009 B. D. Cullity & C. D. Graham Introd. Magn. Materials (ed. 2) x. 353 The C regions have been tentatively identified with the subgrains which form within each plastically deformed grain, and the T regions with the subgrain boundaries.
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