Creep Fracture of Aluminum and Copper Tricrystals Having 〈110〉-Tilt Σ3, 3, 9 Grain Boundaries
Creep Fracture of Aluminum and Copper Tricrystals Having 〈110〉-Tilt Σ3, 3, 9 Grain Boundaries
复制标题
具有<110>-倾斜Σ3,3,9晶界的铝和铜三晶的蠕变断裂
DOI：
10.2320/matertrans.mt-m2020325
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发表时间：
2021
影响因子：
1.2
通讯作者：
T. Tomita
中科院分区：
文献类型：
--
作者：
T. Okada;Hiromu Hisazawa;Akihiro Iwasaki;Katsuya Kawaguchi;Hiroki Morimoto;Kazuki Nakao;Tomoyuki Ueki;T. Tomita
本研究的主要目的是探讨晶界滑动的约束和它的容纳在三通对三晶体的蠕变断裂的影响。用坩埚下降法生长了具有δ 110 α-倾斜δ 3，3，9晶界的纯铝和铜的三晶体。在温度高于0.80 TM（TM代表绝对温标上的熔化温度）时，对拉伸试样进行蠕变试验，其中100 °边界与拉伸轴成45°角。在铝和铜的三晶体，占主导地位的晶界滑动发生沿着的109边界。铝三晶体沿沿着一个横跨晶粒的平面断裂，远离三重结。相比之下，铜三晶体通过沿着晶界完全分离而断裂，随后撕裂剩余部分。这种差异是由三重连接点周围的不同局部变形行为来解释的，以释放由滑动的约束引起的应力集中，例如，在铝中沿沿着晶界滑动，在铜中沿沿着晶界形成裂纹。[doi：10.2320/材料trans.MT-M2020325]
The major objective of the present study was to investigate the effect of the constraint of grain-boundary sliding and its accommodation at triple junctions on the creep fracture of tricrystals. Tricrystals of pure aluminum and copper having ©110a-tilt 3, 3, 9 boundaries were grown by the Bridgman method. Creep tests were carried out for tensile specimens in which the 9 boundary made an angle of 45° with the tensile axis at temperatures above 0.80TM, where TM stands for the melting temperature on the absolute temperature scale. In both aluminum and copper tricrystals, dominant grain-boundary sliding occurred along the 9 boundary. The aluminum tricrystal fractured along a plane across grains, far separated from the triple junction. In contrast, the copper tricrystal fractured via a complete separation along the 9 boundary followed by a tear-off of the remaining portion. This difference is accounted for by the different local deformation behaviors around the triple junctions to release the stress concentration induced by the constraint of 9 sliding, e.g., grain-boundary sliding along the 3 boundary in aluminum and crack formation along the 9 boundary in copper. [doi:10.2320/matertrans.MT-M2020325]