Conference on internal friction due to crystal lattice imperfections

ON INTERNAL FRICTION DUE TO CRYSTAL LATTICE IMPERFECTIONS The level of activity in the field of internal friction has grown rapidly since the meeting at Brown University in September 1956. In the summer of 1960, a group of workers in this field, brought together by one of the Gordon Research Conferences, agreed that another conference on internal friction would be very timely. As a result of that discussion, a conference committee consisting of the undersigned was formed and plans were made for a meeting in July 1961 to be held at Cornell University. The decision to keep the conference small was made early in the planning so as to avoid simultaneous sessions and to maximize interactions between people with common interests. This meant that the scope of the subject matter would have to be restricted and accordingly, the subject matter was limited to internal friction phenomena arising from crystal lattice imperfections. It was also decided that papers dealing only with applications of internal friction, rather than the achievement of a more complete understanding of the phenomena, would be excluded. The subject matter was then divided into four parts, as follows: Part I. Effects Due to Point Defects. Part II. Dislocation Pinning Effects. Part III. Relaxation Peaks Produced by Deformation. Part IV. High Frequency Techniques. The first three of these parts each began with an invited review paper describing the present status of the subject. These were given by B. S. Berry, R. B. Gordon, and H. S. Sack, respectively. The remaining papers were contributed.

As the planning progressed, the committee became convinced that the collection of papers given at the conference would constitute a valuable record of the current status of the subject. Accordingly, it was decided to publish the papers together in a single issue of Acta Metallurgica. At the same time it was felt that it would not be desirable to require a manuscript from every contributor, since this would discourage the presentation of material not yet complete enough for write up or papers already submitted to other journals. The procedure adopted has then been to publish herein abstracts for those papers not submitted in full, so that a complete record of all the talks that were given at the conference would be available. Those discussions given at the conf$rence which present new results have also been incorporated into this issue. The three survey articles are included as the opening paper of each of the first three parts. The committee gratefully acknowledges the sponsorship of the conference jointly by the Atomic Energy Commission and the Advanced Research Projects Agency, which, among other things, made possible participation by several overseas visitors and thereby gave the conference an international flavor.

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A. S. NOWICK H. S. SACK P. J. LEURGANS,Conference

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