Deformation and fracture behavior of the W/ODS-Cu joint fabricated by the advanced brazing technique
Deformation and fracture behavior of the W/ODS-Cu joint fabricated by the advanced brazing technique
复制标题
采用先进钎焊技术制造的W/ODS-Cu接头的变形和断裂行为
DOI：
10.1016/j.fusengdes.2019.03.027
复制
发表时间：
2019
影响因子：
1.7
通讯作者：
the FFHR Design Group
中科院分区：
文献类型：
--
作者：
M. Tokitania;Y. Hamaji;Y. Hiraoka;S. Masuzaki;H. Tamura;H. Noto;T. Tanaka;T. Muroga;A. Sagara;the FFHR Design Group
在我们之前的研究中，氧化物弥散强化铜合金（ODS-Cu）、GlidCop®（Cu-0.3 wt%Al2O3）和钨(W)之间的接头显示出优异的断裂强度（~ 200 MPa）。采用无中间层的BNi-6 （Ni-11%P）填充材料，采用钨和ODS-Cu直接钎焊的方法制备了该接头。这种方法被称为改进的或先进的钎焊技术。在本研究中，研究了三点弯曲试验后接头的变形和断裂行为。首先发现裂纹起裂点主要在W块体中，但裂纹是否从晶界处起裂尚不清楚。其次，裂纹扩展主要在W块体中进行，但倾向于向粘结层偏转。结果表明，该粘结界面具有较好的强度，适用于核聚变堆热流导流器组件等恶劣环境。基于上述物理和技术认识，我们成功地制作了大型导流器模型，该模型有28块W板，每块尺寸为20 × 20 × 5 mm3。
In our previous work, the joint between oxide dispersion strengthened copper alloy (ODS-Cu), GlidCop®(Cu–0.3 wt%Al2O3) and tungsten (W) demonstrated superior fracture strength (∼200 MPa). This joint was fabricated by the direct brazing method between W and ODS-Cu using BNi-6 (Ni–11%P) filler material without any intermediate layer. This method was named as the improved or the advanced brazing technique. In the present study, deformation and fracture behavior of the joint after the three-point bending test was investigated. At first, it was found that the crack initiation points were dominantly in the W bulk, although it was not clear that the crack initiated from grain boundary or not. Secondly, the crack propagation proceeded mostly in the W bulk but tended to deflect towards the bonding layer. These results interpret the strength of the bonding interface is superior and the present bonding technique is applicable for severe environments such as a high heat flux divertor component on the fusion reactor. Based on the above physical and technological understanding, we successfully fabricated the large scale divertor mock-up which has twenty-eight plates of W with each size of 20 × 20 × 5 mm3.