Haboub Abdel, Bale Hrishikesh A, Nasiatka James R, Cox Brian N, Marshall David B, Ritchie Robert O, MacDowell Alastair A
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.
Rev Sci Instrum. 2014 Aug;85(8):083702. doi: 10.1063/1.4892437.
A compact ultrahigh temperature tensile testing instrument has been designed and fabricated for in situ x-ray micro-tomography using synchrotron radiation at the Advanced Light Source, Lawrence Berkeley National Laboratory. It allows for real time x-ray micro-tomographic imaging of test materials under mechanical load at temperatures up to 2300 °C in controlled environments (vacuum or controlled gas flow). Sample heating is by six infrared halogen lamps with ellipsoidal reflectors arranged in a confocal configuration, which generates an approximately spherical zone of high heat flux approximately 5 mm in diameter. Samples are held between grips connected to a motorized stage that loads the samples in tension or compression with forces up to 2.2 kN. The heating chamber and loading system are water-cooled for thermal stability. The entire instrument is mounted on a rotation stage that allows stepwise recording of radiographs over an angular range of 180°. A thin circumferential (360°) aluminum window in the wall of the heating chamber allows the x-rays to pass through the chamber and the sample over the full angular range. The performance of the instrument has been demonstrated by characterizing the evolution of 3D damage mechanisms in ceramic composite materials under tensile loading at 1750 °C.
一种紧凑的超高温拉伸测试仪器已被设计并制造出来，用于在劳伦斯伯克利国家实验室的先进光源处使用同步辐射进行原位X射线显微断层扫描。它能够在可控环境（真空或可控气流）中，对温度高达2300°C的机械负载下的测试材料进行实时X射线显微断层成像。样品加热通过六个带有椭球形反射器的红外卤素灯实现，这些灯以共焦配置排列，产生一个直径约5毫米的近似球形的高热通量区域。样品被夹在连接到电动平台的夹具之间，该平台以高达2.2 kN的力对样品进行拉伸或压缩加载。加热室和加载系统采用水冷以保持热稳定性。整个仪器安装在一个旋转平台上，可在180°的角度范围内逐步记录射线照片。加热室壁上的一个薄圆周（360°）铝窗允许X射线在整个角度范围内穿过加热室和样品。通过表征陶瓷复合材料在1750°C拉伸载荷下三维损伤机制的演变，证明了该仪器的性能。
