Plastic Deformation of Al&ndash;Li Single Crystals Containing Al<SUB>3</SUB>Li Particles

DOI Web Site 被引用文献6件 参考文献13件
  • Tamura Manabu
    Graduate School, Department of Metallurgical Engineering, Tokyo Institute of Technology
  • Mori Tsutomu
    Department of Metallurgical Engineering, Tokyo Institute of Technology
  • Nakamura Tadahisa
    Department of Metallurgical Engineering, Tokyo Institute of Technology

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タイトル別名
  • Plastic Deformation of Al–Li Single Crystals Containing Al<SUB>3</SUB>Li Particles

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The effect of the presence of the ordered particles, Al3Li, on plastic deformation was studied at room temperature and at −196°C by using Al–3%Li single crystals. The volume fraction and the size of Al3Li ranged between 0.6 and 22% and 35 and 850Å respectively. Stress-strain curves and slip morphology were investigated. Microstructures of the deformed specimens were also observed by means of transmission electron microscopy. Sharp serrated flow which accompanied the formation of distinct and inhomogeneous slip bands was observed. For all the volume fractions and the sizes of the precipitate particles investigated, the particles were found to be sheared with only a few percent of elongation. The inverse temperature dependence of flow stress which is observed for a single phase alloy with the Ll2 structure was also detected in the crystals with high volume fractions of Al3Li. From its orientation dependence this phenomenon was explained on the basis of the frequency of pinning of dislocations caused by cross slip of a pair of superlattice dislocations into a cube plane. It has been established that the precipitation hardening at sufficiently low temperatures at which the cross slip does not occur can be determined by the resistance induced when a pair of superlattice dislocations cuts through the ordered particles.

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