本文报道了不同取向Al单晶体在循环形变过程中的应力响应、内耗和超声衰减的变化及它们之间的关系,试验结果表明,循环应力σ、内耗Q~(-1)和超声衰减△α对晶体取向有明显的依赖性,单滑移取向和多滑移取向晶体之间,上述三量的差别很大,对同一取向晶体,σ增加对应着Q~(-1)减少和Δa增加,但Δa达到最大值需要的循环周次少于σ达到最大值所需的循环数,而Q~(-1)与σ则基本上同时达到最低值和最大值。
Studies were made of the variation of stress response, σ, internal friction, Q~(-1), and ultrasonic attenuation Aa, during cyclic deforamtion and correlation among them withdifferent slip orientation Al single crystals. Results indicate that they have obvious depen-dence upon slip orientation of Al single crystals. They are many differences for Q~(-1), △αand σbetween mono-slip and multi-slip Al single crystals. For the Al single crystals with sameorientation, the increase of σ corresponds with reduction of Q~(-1) and increase of △α, yet therequired number of cycles approaching the maximum of △α may be less than that of α up tomaximmu. And the Q~(-1) and σ may reach minimum and maximum, respectively, at samenumber of cycle.
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