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<p>[QUOTE=&quot;Oldhoopster, post: 8046709, member: 84179&quot;][USER=24314]@Insider[/USER]&nbsp; I&#039;m a little late on the response.</p><p><br /></p><p>In ceramics, we call these regions grains or domains, and they are separated by grain boundaries. The grains usually have specific crystallographic orientations. I&#039;ve seen the same terminology used in metallurgy although my experience in that field is limited.&nbsp; It&#039;s basically the same thing as a single crystal (but material scientists need to make things complicated <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" />).&nbsp; </p><p><br /></p><p>To confuse things, the term grain can also be used to describe polycrystalline particles.&nbsp; A grain of sand may or may not be a single crystal.</p><p><br /></p><p>I like using the term &quot;grain domain&quot; to describe what you&#039;re seeing.&nbsp; I think it describes the region and clarifies between single crystal and polycrystalline grains.&nbsp; I&#039;ve occasionally&nbsp; come across the term in ceramic literature but am not sure if it&#039;s used much in metallurgy.[/QUOTE]</p><p><br /></p>

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