Initial Stages of Ordering In Ni4Mo

<p>Transmission eleotron and field ion microscopy<br>techniques were used to study the nature of short range order (SHO) in as-quenched Ni^o and the ohangee which occur during the very initial stages of the transition to the long range ordered state.<br>Piold ion images of both as-quenohed and alloys aged for very short times below ?50°C show a strong tendency for clustering of well defined groups of atoms about the l<*20> foe poles. The effeot is most pronounced in aged alloys where ordered regions were directly resolved in dark field eleotron micrographs. However the effect is also observed in the alloyB in which ordered regions are<br>not directly resolved in transmission electron micrographs. The unique orientation dependence of the distribution of the well defined groups of atoms is evidence that the disordered alloy consists of tiny regions possessing a layered type of atomio arrangement in which the Ho concentration is varying on the Ct20) matrix planes.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>