Deformation of Single Crystal Molybdenum at High Pressure.

Bonner, B. P. ; Aracne, C. ; Farber, D. L. ; Boro, C. O. ; Lassila, D.

Technical Information Center Oak Ridge Tennessee

关键词: Single crystals;    Molybdenum;    Deformation;    Compression;    Accuracy;   

RP-ID  :  DE200415009799

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Single crystal samples of micron dimensions oriented in the direction were shortened 10 to 40% in uniaxial compression with superposed hydrostatic pressure to begin investigation of how the onset of yielding evolves with pressure. A testing machine based on opposed anvil geometry with precision pneumatic control of the applied force and capability to measure sub micron displacements was developed to produce shape changing deformation at pressure. The experiments extend observations of pressure dependent deformation to (approx.)5Gpa at shortening rates of (approx.)2*10(sup -4). Samples have been recovered for post run characterization and analysis to determine if deformation mechanisms are altered by pressure. Experiments under hydrostatic pressure provide insight into the nature of materials under extreme conditions, and also provide a means for altering deformation behavior in a controlled fashion.