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首页> 外文会议>Symposium on Quasicrystals-Preparation, Properties and Applications Nov 27-30, 2000, Boston, Massachusetts, U.S.A. >Low temperature plastic behaviour of icosahedral AlCuFe quasicrystals
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Low temperature plastic behaviour of icosahedral AlCuFe quasicrystals

机译：二十面体AlCuFe准晶体的低温塑性行为

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摘要

The mechanism by which dislocations move in the icosahedral quasicrystalline structure, i.e., glide or climb, is still an open question. In order to check whether pure dislocation glide occurs in this quasi-periodic structure, low temperature deformation tests have been performed under confining pressure conditions. These experimental techniques, which superimpose a shear stress on an isostatic component, enable the brittle-to-ductile transition temperature to be shifted to temperatures at which diffusion processes can be assumed to be negligible. Such techniques have been applied to deform plastically AlCuFe poly-quasicrystals at low and intermediate temperatures, using both gas and solid-confining media. Mechanical data as well as microstructural observations associated with this low temperature deformation range are reported. The first results provide new insights into the deformation mechanisms that control plasticity in the icosahedral quasicrystalline phase.
机译：位错在二十面体准晶体结构中移动的机制，即滑移或爬升，仍然是一个悬而未决的问题。为了检查在这种准周期结构中是否发生了纯位错滑移，在限制压力条件下进行了低温变形试验。这些将剪切应力叠加在等静压部件上的实验技术，使脆性至延性转变温度转变为可以认为扩散过程可以忽略的温度。已经使用气体和固体限制介质在低温和中温下将这种技术用于使AlCuFe多准晶体塑性变形。报道了与该低温变形范围相关的机械数据以及微观结构观察。第一个结果为控制二十面体准晶相可塑性的变形机制提供了新见识。

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