Ductile-Phase Toughened Tungsten for Plasma Facing Materials
Ductile-Phase Toughened Tungsten for Plasma Facing Materials
复制标题
用于等离子表面材料的延展相增韧钨
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Kevin Cunningham
中科院分区：
文献类型：
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作者：
Kevin Cunningham
作者：Cunningham，Kevin Hawkins|顾问：Odette，G Robert|翻译后摘要：各种加工方法被用来制造韧性相增韧（DPT）钨（W）复合材料。力学测试和分析建模用于指导复合材料的开发。本工作为进一步开发用于未来聚变堆偏滤器结构部件的W复合材料提供了基础。铜（Cu）或碳化钨（WC）的涂层分别通过电沉积和渗碳施加到钨丝上。使用放电等离子烧结（SPS），以巩固W粉与每种类型的涂层W线一起制造复合材料。烧结复合材料的三点弯曲试验没有观察到裂纹止裂和裂纹桥接等DPT行为。通过热压将该层合板粘结到厚W板上作为增强层，并对复合材料进行了三点弯曲试验。观察到裂纹止裂沿着与一些纤维拔出，但显着的横向裂纹在W板混淆进一步的断裂韧性分析。W板与Cu箔钎焊以形成层压板。在三点弯曲试验中观察到了裂纹止裂和裂纹桥接现象，并成功地计算了该复合材料的断裂阻力曲线，在Chao等人的基础上建立了裂纹桥接的分析模型。该模型使用试样的几何形状，基质的属性，和韧性钢筋的应力-位移函数（“桥接法”），计算断裂阻力曲线（R-曲线）和载荷-位移曲线（P-D曲线）的任何测试试样的几何形状。该代码也被实现，以估计一个任意的复合材料的R-曲线数据的桥接law.最后，进行了参数研究，以定量地确定有用的增韧增强DPT W复合材料所需的力学性能。分析模型具有广泛的适用性，任何DPT材料。
Author(s): Cunningham, Kevin Hawkins | Advisor(s): Odette, G Robert | Abstract: A variety of processing approaches were employed to fabricate ductile-phase-toughened (DPT) tungsten (W) composites. Mechanical testing and analytical modeling were used to guide composite development. This work provides a basis for further development of W composites to be used in structural divertor components of future fusion reactors.W wire was tested in tension, showing significant ductility and strength. Coatings of copper (Cu) or tungsten carbide (WC) were applied to the W wire via electrodeposition and carburization, respectively. Composites were fabricated using spark plasma sintering (SPS) to consolidate W powders together with each type of coated W wire. DPT behavior, e.g. crack arrest and crack bridging, was not observed in three-point bend testing of the sintered composites.A laminate was fabricated by hot pressing W and Cu foils together with W wires, and subsequently tested in tension. This laminate was bonded via hot pressing to thick W plate as a reinforcing layer, and the composite was tested in three-point bending. Crack arrest was observed along with some fiber pullout, but significant transverse cracking in the W plate confounded further fracture toughness analysis.The fracture toughness of thin W plate was measured in three-point bending. W plates were brazed with Cu foils to form a laminate. Crack arrest and crack bridging were observed in three-point bend tests of the laminate, and fracture resistance curves were successfully calculated for this DPT composite.An analytical model of crack bridging was developed using the basis described by Chao in previous work by the group. The model uses the specimen geometry, matrix properties, and the stress-displacement function of a ductile reinforcement (“bridging law”) to calculate the fracture resistance curve (R-curve) and load-displacement curve (P-D curve) for any test specimen geometry. The code was also implemented to estimate the bridging law of an arbitrary composite using R-curve data.Finally, a parametric study was performed to quantitatively determine the necessary mechanical properties of useful toughening reinforcements for a DPT W composite. The analytical model has a broad applicability for any DPT material.