Establishing various processing routes and their effect on microstructure and high temperature properties for alloys with melting temperatures >1900°C

建立熔化温度>1900℃合金的各种加工路线及其对显微组织和高温性能的影响

• 批准号: 404942487
• 负责人: Professor Dr.-Ing. Uwe Glatzel
• 金额: --
• 依托单位: National Science and Technology Council (NSTC)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/404942487?language=en
• 关键词: Establishing; various; processing; routes; their

Refractory metal based alloys are generally produced by powder metallurgy. Up to now, little is known about ingot metallurgy produced materials with melting points exceeding 1900°C. The already known methods are only suitable for the fabrication of small sample quantities, or have very limited geometric freedom. Therefore, the aim of this proposal is to improve various ingot metallurgy routes to fabricate alloys with melting points >1900°C. This project will be carried out in close collaboration with Prof. An-Chou Yeh of National Tsing Hua University, Taiwan. In this joint work, the materials of interest include Mo-9Si-8B-2Al (at.%), Cr-7Si-2Ge-2Mo (at.%), and Mo-Al-Ti-based alloys. The work-shares between University Bayreuth and National Tsing Hua University are as follows:University Bayreuth will be responsible of (1) Optimization of the vacuum induction melting process for casting the above mentioned alloys, for sample quantities of up to 2.5 kg. The focus is to achieve a porosity < 1.0 vol.% and to avoid segregations. (2) Microstructural observations at the alloy/crucible interface and alloy center. (3) Comparison of the creep properties of VIM and floating zone (FZ) produced samples at temperatures up to 1700°C in a vacuum tensile creep testing device.National Tsing Hua University will take charge of (1) Optimization of floating zone technique for achieving single crystals with sizes of > 9 mm in diameter and > 40 mm in length. (2) Study the elemental segregations, phase transformations. (3) Determination of oxidation behaviors up to 1700 °C as function of the two production routes, vacuum induction and floating zone melting.

耐火金属合金通常由粉末冶金产生。到目前为止，对于熔融冶金生产的材料，熔点超过1900°C的材料知之甚少。已经知道的方法仅适用于制造少量样品量，或者具有非常有限的几何自由度。因此，该提案的目的是改善各种Ingot冶金路线，以熔点> 1900°C制造合金。该项目将与台湾的全国Hua University的An-Chou Yeh教授密切合作。在这项联合工作中，感兴趣的材料包括MO-9SI-8B-2AL（AT。％），CR-7SI-2GE-2GE-2MO（AT。％）和基于MO-AL-TI的合金。拜罗伊特大学和国家tsing Hua大学之间的工作共享如下：BayReuth大学将负责（1）优化真空吸收熔化过程，用于施放上述合金，以最高2.5 kg的样品数量。重点是达到孔隙率<1.0卷％并避免隔离。 （2）在合金/坩埚界面和合金中心的微观结构观测。 （3）比较VIM和浮动区（FZ）在真空伸缩式蠕变测试设备中，在高达1700°C的温度下生产样品。 （2）研究元素分离，相变。 （3）确定最高1700°C的氧化行为是两种生产途径的功能，真空感应和浮动区熔化。