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Development of Testing Machine for Mechanical Properties at Ultra High Temperature using Impulse Electron Irradiation

脉冲电子辐照超高温力学性能试验机的研制

基本信息

批准号：
07555502
负责人：
UMAKOSHI Yukichi
金额：
$ 1.09万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555502/
关键词：
electron irradiation mechanical property ultra high temperature strength intermetallics ductility fracture silicide 耐熱材料変形

项目摘要

Testing machine for mechanical properties of ultra high-temparture refractory materials has been developed. Special vacuum chamber was built for impulse electron bombardment system. Electron irradiation was carried out at 30kV in vacuum. To hold the specimen during mechanical testing, ceramic holder was used. The maximum temperature which was obtained using this heating system was around 2000ﾟC.High heating rate of 500ﾟC/min was obtained. The thermal stability during mechanical test was less than 2ﾟC.Since test specimens of metallic materials were directly heated by electron irradiation, mechanical test at ultra high temperature could be done. For ceramic specimens the specimen surface was convered by tantalum tube and then high temperature was realozed. The thermal gradient between upper and bottom sides of specimens was very small. The displacement of specimens during tesile or comression tests was measured using laser light. Mechanical properties of transition metal silicides such as MoSi_2 and NbSi_2 which are attractive candidates for refractory materials operating around 2000ﾟC were investigated by means of this testing machine. MoSi_2 and NbSi_2 showed anomalous strengthening above 1200ﾟC and the anomalous peak was shifted to higher temperture by addition of small amounts of third element. Mechanical properties of TiAl alloys were also investigated. The temperature dependence of strength and ductility of these alloys was easily obtained using this machine.

研制了超高温耐火材料力学性能试验机。为脉冲电子轰击系统建造了专用真空室。在真空中以30 kV进行电子照射。为了在机械测试期间固定样本，使用陶瓷保持器。使用该加热系统获得的最高温度约为2000 ℃。获得了500 ℃/min的高加热速率。机械试验时的热稳定性小于2 ℃。由于金属材料的试样是通过电子辐照直接加热的，因此可以进行超高温下的机械试验。对于陶瓷试样，采用钽管覆盖试样表面，实现高温烧结。试样上下两侧的温度梯度很小。在拉伸或压缩试验过程中，使用激光测量试样的位移。利用该试验机研究了MoSi_2和NbSi_2等过渡金属硅化物在2000 ℃左右的力学性能。MoSi_2和NbSi_2在1200 ℃以上表现出反常强化，而少量第三元素的加入使反常峰向高温移动。研究了TiAl合金的力学性能。利用这台试验机可以很容易地得到这些合金的强度和塑性随温度的变化关系。