加强钨复合材料的热疲劳损伤机理

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2023年1月9日Reviewed bySkyla Baily

A research group has recently performed an investigation into the relationship between microstructure evolution and property degradation of two representative second-phase dispersion-strengthened tungsten materials following electron beam thermal loading。

The study was performed by a research group from theHefei物理科学研究所欧洲杯线上买球（HFIP），中国科学院（CAS）。欧洲杯线上买球

The associated research was reported in the材料科学技术杂志欧洲杯足球竞彩欧洲杯线上买球。

Plasma-facing tungsten (W) materials in the magnetic confinement nuclear fusion devices have been exposed directly to high-temperature plasma and are normally subjected to transient thermal shocks of ~1 GW/m²5至20 mW/m的稳态热负荷²。这可以有助于将钨的表面温度提高到1800多个。

The elevated heat flux load to W results in some irreversible material damages, like surface cracking, roughening, and surface melting. Hence, it is pressing to assess the thermal load resistance of W materials.

在这项研究中，科学家在电子束设备（电子束材料研究平台（EBMP-30））上进行了重复的热载荷，最大为30 kW。该平台旨在计算面向等离子体材料（PFM）的热冲击阻力。欧洲杯足球竞彩

“它采用30 kW的焊接电子光束，最大加速度电压为100 kV,"it can scan 30 × 30 mm2 area with maximal frame rate of 35 kHz, and its pulse duration can change from 100 ms to a continuous state” Zhuoming解释说，他协助建立了平台。

Depending on the EBMP-30 device, two representatives W-0.5 wt% ZrC (WZC) and W-1.0 wt% Y₂o₃选择（WYO）复合材料以了解复发稳态热载荷引起的损伤行为，吸收功率密度（APD）在10至30 mW/m的范围内²。

结果表明，当APD≤20mW/m时，WZC和WYO标本的拉伸和微观结构特性不会发生很大变化²。但是当apd≥22mW/m时²WYO标本和Y的谷物生长和完全重结晶₂o₃particle shedding from the W matrix were detected.

此外，WYO的最终拉伸强度和总伸长率从861 MPa下降到510 MPa，分别从15％下降到接近零。

由于Y的热膨胀（CTE）的不同系数₂o₃phase and W, irreversible plastic deformation of the W matrix occurs, especially around the coarse Y₂o₃粒欧洲杯猜球平台子导致y之间的接口₂o₃粒欧洲杯猜球平台子和W矩阵。

中国科学学院Hefei物理科学研究所的研究首席作者Xuebang Wu欧洲杯线上买球

在22 mW/m处的热载荷后², WZC specimens retained the high ultimate tensile strength of 816 MPa as a result of their high recrystallization temperature (approximately 1300 ℃).

ZRC颗粒的细胞和均匀分布及其与W矩阵的可比CTE欧洲杯猜球平台有效地避免了ZRC粒子脱落和微裂纹的形成。

中国科学学院Hefei物理科学研究所的研究首席作者Xuebang Wu欧洲杯线上买球

Wu added, “This study reveals the correlations between the microstructure evolution and performance degradation in two representative second-phase dispersion strengthened tungsten materials, as well as the mechanism of fatigue damage by high thermal loads这为进一步开发高性能钨材料提供了重要的参考欧洲杯足球竞彩。”