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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Microstructures and mechanical properties of the novel CuCrZrFeTiY alloy for fusion reactor
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Microstructures and mechanical properties of the novel CuCrZrFeTiY alloy for fusion reactor

机译：熔融反应器新型Cucrzrfetiy合金的微观结构和力学性能

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Cu-Cr-Zr alloy has been widely considered to be used as heat sink materials in the fusion reactor due to its superior properties. However, Cu-Cr-Zr alloy suffers significant creep deformation and softening as the temperatures is above 300-400 degrees C. Advanced Cu alloys with high strength, high conductivity and high thermal stability need to be developed to meet the requirements in the future fusion reactor. In this work, a novel Cu-Cr-Zr-Fe-Ti-Y alloy was designed and prepared by vacuum induction melting, followed by homogenization treatment, hot-rolled, solid solution, cold-rolled and aging treatments. Tensile properties, hardness and electrical conductivity of the alloys aging at different temperatures were tested. The alloy aged at 500 degrees C exhibits excellent tensile strength up to 541 MPa and high electrical conductivity of 82% IACS. The alloy maintains high tensile strength even annealing at 500 degrees C for 72 h. The microstructures of the alloy were characterized by optical, scanning and transmission electron microscopy, and it is found that the high thermal stability of the novel alloy is mainly contributed to two reasons. One is the high friction of low-Sigma CSL grain boundaries (mainly Sigma 3) with low energy detected in the matrix, which are difficult to slid and have higher thermal stability than general high-angle grain boundaries. Another one is the two kinds of high-density precipitates detected in the matrix. The larger Cr1.4Fe particles are semi-coherent with the matrix, and the orientation relationship is [011](Cu)//[011](Cr1.4Fe), (100)(Cu)//(01 (1) over bar)(Cr1.4Fe) and (11 (1) over bar)(Cu)//((2) over bar1 (1) over bar)(Cr1.4Fe). The smaller Cr particles are coherent with the matrix, and the orientation relationship is [011](Cu)//[(1) over bar 11](Cr), (100)(Cu)//(01 (1) over bar)(Cr) and (0 (1) over bar1)(Cu)//(211)(Cr). The strengthening mechanism of the alloy was analyzed in details, and the calculation yield strength (480 MPa) is well coincident with the experimental value (473 MPa). (C) 2020 Elsevier B.V. All rights reserved.
机译：Cu-Cr-Zr合金被广泛认为由于其优异的性能而被用作熔融反应堆中的散热材料。然而，Cu-Cr-Zr合金具有显着的蠕变变形和软化，因为温度高于300-400℃。需要开发高强度，高导电性和高热稳定性的高级Cu合金以满足未来融合的要求反应堆。在这项工作中，通过真空感应熔化设计和制备了一种新的Cu-Cr-Zr-Fe-Ti-Y合金，然后进行均质化处理，热轧，固溶体，冷轧和老化处理。测试了在不同温度下老化的抗拉性，硬度和导电性进行了测试。 500℃下老化的合金具有优异的拉伸强度，高达541MPa和82％IACS的电导率高。该合金在500℃下，保持高抗拉强度，甚至在500℃下进行72小时。通过光学，扫描和透射电子显微镜的特征在于合金的微观结构，并且发现新颖性合金的高热稳定性主要导致了两个原因。一种是在基质中检测到低能量的低ΣCSL晶界（主要是Sigma 3）的高摩擦，这难以滑动并且具有比一般大角晶晶界更高的热稳定性。另一个是在基质中检测到的两种高密度沉淀。较大的Cr1.4Fe颗粒与基质半相干，方向关系是[011]（Cu）// [011]（Cr1.4Fe），（100）（Cu）//（01（1））棒）（Cr1.4fe）和（11（1）覆盖条）（Cu）//（（2）上方的Bar1（1））（Cr1.4Fe）。较小的Cr颗粒与基质相干，方向关系是[011]（Cu）// [（1）上方的条形图11]（Cr），（100）（Cu）//（01（1）上方）（Cr）和（0（1）上Bar1）（Cu）//（211）（Cr）。详细分析了合金的强化机理，并将计算屈服强度（480MPa）与实验值（473MPa）孔均匀。 （c）2020 Elsevier B.v.保留所有权利。

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