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limit; while the other phase (ß) is present alone wherever this limit is exceeded. They also make plain the migration of the phase boundary with continued diffusion. Finally they show that the higher order diffraction lines from the ß phase are much less intense than those of the a phase, a fact probably due to the severe cold working which occurs as ß is formed from a by a sudden expansion of over 3% (linear) at the advancing phase boundary.

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