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Ultrafine grained materials are capable of superplastic elongation at strain rates approximately two orders of magnitude faster than those currently employed for commercial superplastic forming operations. However, such operations require the material in the form of thin sheets. Therefore, in this work, a new approach to produce ultrafine grained plate samples using a modified equal channel angular...
Distributions of near-coincidence grain boundaries that occur during equal channel angular pressing in magnesium single crystals at 503K are investigated. The coincidence boundaries with the [0001] misorientation axis are frequent in the sample after passage of the shear plane and recrystallization. In contrast, twin boundaries dominate in the end parts of the samples. Existence of a 30° peak in the...
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