Plastic deformation of yttria stabilized cubic zirconia single crystals I. Activation parameters of deformation
Plastic deformation of yttria stabilized cubic zirconia single crystals I. Activation parameters of deformation
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氧化钇稳定立方氧化锆单晶的塑性变形Ⅰ.变形活化参数
DOI：
10.1002/pssa.200306715
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
U. Messerschmidt
中科院分区：
文献类型：
--
作者：
A. Tikhonovsky;M. Bartsch;U. Messerschmidt
在1400 °C和最低可能温度之间，使含有10摩尔%氧化钇的立方氧化锆沿着硬取向100 ° C方向变形，并且使含有15和20摩尔%氧化钇的材料沿着沿着软取向112 ° C方向变形，而没有脆性破坏。10%的材料显示出沿着100纳米的流动应力在降低温度下的强烈增加，而具有15和20摩尔%氧化钇的材料沿沿着112纳米表现出较高的流动应力，具有弱的温度依赖性。通过应力松弛试验和变温试验测定了变形激活参数。的微观结构进行了研究，通过高压透射电子显微镜。这些结果通过位错之间的长程相互作用、最低温度下的Peierls机制、500 °C至800 °C之间的沉淀硬化以及高温下的回复控制变形来解释。塑性不稳定性的发生在第二部分[物理统计]中描述。Sol. (a)201，No. 1（2004）]。
Cubic zirconia containing 10 mol% yttria was deformed along the hard 〈100〉 direction and materials with 15 and 20 mol% yttria along the soft 〈112〉 orientation between 1400 °C and the lowest possible temperatures without brittle failure. The 10% material shows along 〈100〉 a strong increase in the flow stress at decreasing temperature, while the materials with 15 and 20 mol% yttria along 〈112〉 exhibit a higher flow stress with a weak temperature dependence. The activation parameters of deformation were measured by stress relaxation and temperature change tests. The microstructures are studied by high-voltage transmission electron microscopy. The results are interpreted by long-range interactions between the dislocations, the Peierls mechanism at the lowest temperatures, precipitation hardening between 500 °C and 800 °C, and by recovery-controlled deformation at high temperatures. The occurrence of plastic instabilities are described in Part II [phys. stat. sol. (a) 201, No. 1 (2004)] of this paper.