Microstructural evolution and thermal fatigue damage mechanism of second-phase dispersion strengthened tungsten composites under repetitive thermal loads
Microstructural evolution and thermal fatigue damage mechanism of second-phase dispersion strengthened tungsten composites under repetitive thermal loads
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重复热载荷下第二相弥散强化钨复合材料的显微组织演化及热疲劳损伤机制
DOI：
10.1016/j.jmst.2022.09.007
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发表时间：
2022-10
影响因子：
10.9
通讯作者：
Xuebang Wu
中科院分区：
文献类型：
--
作者：
Hui Wang;Zhuoming Xie;Xiang Cheng;Ke Jing;Linchao Zhang;Junfeng Yang;Rui Liu;Le Han;Lei Cao;Xianping Wang;Qianfeng Fang;Changsong Liu;Xuebang Wu
在聚变反应堆中，面向等离子体的钨（W）材料不可避免地会遭受严重的热冲击，而W材料在重复高热负荷下的性能是反应堆长期稳定运行的关键问题之一。在这项工作中，两个代表性的W-0.5wt.%的显微组织演变和热疲劳抗力，ZrC（WZC）和W-1.0重量%研究了Y2 O3（WYO）复合材料在循环热载荷作用下的力学性能。由于ZrC和Y2 O3颗粒的固有性质，如热膨胀系数、颗粒尺寸和在W晶粒中的分布，WZC复合材料表现出比WYO更好的抗热震性。在热负荷（APD ≥ 22 MW/m2）下，WYO晶粒明显长大，Y2 O3颗粒脱落，力学性能下降。而WZC只有在APD ≥ 25 MW/m2时才会出现上述损伤行为。此外，一个有趣的裂纹机制在W复合材料中被揭示由于界面脱粘和第二相粒子从W基体的逐步脱落。对WZC和WYO试样的微观组织和拉伸性能进行了研究，并证明了微观组织演变与性能退化之间的相关性。研究结果对评价氧化物/碳化物弥散强化钨基复合材料的抗热疲劳性能及其在未来聚变堆中的应用具有重要意义。
In a fusion reactor, plasma-facing tungsten (W) materials inevitably suffer severe thermal shock, and the performance of W materials under repetitive high heat loads is one of the key concerns for long-term stable operation of the reactor. In this work, the microstructural evolution and thermal fatigue resistance of two representative W-0.5 wt.% ZrC (WZC) and W-1.0 wt.% Y2O3(WYO) composites were investigated under cyclic heat loads. Due to the intrinsic properties of ZrC and Y2O3particles such as coefficients of thermal expansion, particle size and distributions in W grains, the WZC composite exhibited a better thermal shock resistance than WYO. After thermal loads with the absorbed power density (APD) ≥ 22 MW/m2, WYO showed obvious grain growth, Y2O3particles shedding and degradation of mechanical properties. While, in the case of WZC, these damage behaviors only occurred when APD ≥ 25 MW/m2. Furthermore, an interesting crack mechanism in W composites was revealed due to interface debonding and progressive shedding of second-phase particles from the W matrix. The microstructures and tensile properties of the thermally loaded WZC and WYO specimens were also investigated and the correlations between the microstructure evolution and performance degradation are demonstrated. The results are useful for evaluating the thermal fatigue resistance of oxide/carbide dispersion strengthened W composites and their application in future fusion reactors.
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