Investigations on deformation mechanism of monocrystalline B2 rare-earth intermetallic compounds at low temperatures

单晶B2稀土金属间化合物低温变形机制研究

• 批准号: 215125315
• 负责人: Professor Dr. Werner Skrotzki
• 金额: --
• 依托单位: Professur für Metallphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/215125315?language=en
• 关键词: Investigations; deformation; mechanism; monocrystalline; B2

Tensile test are performed on monocrystalline B2 rare-earth intermetallic compounds (YCu, YAg) of different orientations in the temperature range between 296K and 4K in order to specify the deformation mechanism. Activation parameters are determined by means of stress relaxation experiments and strain-rate-change experiments at several temperatures. On the one hand there is the unique opportunity to study the influence of a second phase (B27-structure) on the deformation mechanism to contribute to the understanding of the brittle-to-ductile transition of YCu. On the other hand the deformation mechanism of YAg can be investigated in a large temperature range and possible changes of mechanism can be detected. By comparing conclusions about the causes of exceptionally high ductility of these B2 intermetallic compounds can be drawn. The goal is a better understanding of the low brittle-to-ductile transition of B2 rare-earth intermetallic compounds.

为了明确变形机制，在296K至4K的温度范围内对不同取向的单晶B2稀土金属间化合物（YCu、YAg）进行拉伸试验。活化参数通过多个温度下的应力松弛实验和应变率变化实验来确定。一方面，这是研究第二相（B27 结构）对变形机制的影响的独特机会，有助于理解 YCu 的脆性到延性的转变。另一方面，可以在大温度范围内研究YAg的变形机制，并可以检测机制可能的变化。通过比较，可以得出这些 B2 金属间化合物具有极高延展性的原因的结论。目标是更好地了解 B2 稀土金属间化合物的低脆性到韧性转变。