铝钛双金属板KR曲线测定

利用宽３００ｍｍ、长／宽＝１的横向ＣＴＴ试样对国产铝钛双金属板做了常规力学性能测定，并按航标测定了ＫＲ曲线，经过柔度法和Ｋ值计算，分别测得了ＫＲｉ和ａｉ数据，确定了临界的ＫＣ值通过性能数据对比，研制的材料达到了进口料的性能要求。     

Analytical and experimental analysis of deep drawing process for bimetal elements

The paper presents the concepts of solving of deep drawing process for bimetal elements of sheet materials. The inertia forces, plastic hardening behaviour of the deformed material and dynamic stress are utilized in the problems of plasticity. The experimental results and general conclusion are presented at the end of the paper.     

含双金属的超稳Y沸石负载SO2-4/ZrO2强酸性催化剂上正庚烷临氢异构化

用超稳Y沸石（USY）负载SO2-4/ZrO2固体超强酸，并以此为载体制备含Pt双金属催化剂，用XRD和H2-TPR表征了催化剂的物化性质，并在常压固定床反应器上考察催化剂的正庚烷临氢异构化反应性能。结果表明， USY负载了SO2-4/ZrO2和双金属以后仍能保持沸石原有结构；贵金属Pt、金属助剂以及ZrO2等在USY载体上能够高度分散。在含Pt的催化剂中掺杂了Cr或Al金属助剂以后，正庚烷异构化产物选择性有了明显的提高，且具有更好的稳定性和低温活性；在USY负载SO2-4/ZrO2和0.4%Pt的催化剂上，正庚烷的转化率为42.1%时，异构化产物的选择性只有69.6%，而在掺杂了与Pt摩尔比为5∶1的Cr或Al后，正庚烷的转化率分别为44.3%和42.1%时，异构化产物的选择性分别可提高到88.9%和89.5%。     

半绝缘衬底上Si掺杂InP的纳米孔腐蚀与电学性质研究

利用MOCVD在InP半绝缘衬底上生长N型InP,在KOH溶液中电化学腐蚀形成纳米多孔结构的。通过实验证实在半绝缘衬底上的InP纳米孔腐蚀具有可行性,并且得到了腐蚀质量较好、图形清晰、结构规整的纳米孔材料。在对其进行霍尔测试,得到了腐蚀孔对于n型InP材料表面电学性质的改变,实现了低掺杂浓度(10~(18)cm~(-3))的InP通过表面纳米孔腐蚀的方式提高载流子浓度,改善n型InP层表面电学性能。     

双金属固相结合的有限元分析

双金属是由两种不同性能的金属结合而成的，经过恰当组合的两种金属结合以后，可以获得高强度、耐腐蚀以及导电、导热等综合性能，使材料在某些特殊的环境下发挥良好的作用。固相结合法是制造双金属的有效方法。本文基于刚粘塑性有限元理论，在两组元金属相互接触的表面之间引入摩擦单元，对Ｃｕ／Ａｌ双金属挤压固相结合的非稳态过程进行了有限元分析，得到了两组元金属之间的相对滑动量以及成形过程中的载荷－行程曲线，计算结果与试验结果比较接近。同时获得了变形体内的应力、应变分布，揭示了组元金属在成形过程中的流动规律。     

型内感应加热铝-钢双金属复合界面的研究

双金属复合铸件外圈采用铸造铝合金，内圈选取碳素结构钢，采用型内感应加热工艺进行复合。造型时内层钢套预先放置在砂型中，复合时将包含有钢套的砂型整体放人到感应圈内采用中频感应原理对钢套进行预热，达到预定温度后浇注并继续进行加热，复合层将基体钢套包覆后停止加热。所得到的双金属复合铸件结合界面为完全冶金结合，复合层组织为连续分布FeAl3与Fe2Al5中间化合物，界面结合强度为76．4MPa。     

充芯连铸法制备铜包铝双金属复合材料的研究

提出了一种制备包覆双金属复合材料的新工艺,即充芯连铸法制备包覆双金属复合材料的工艺.试验研究了铜包铝双金属棒制备的工艺,分析了铜包铝双金属棒的外观、断面和界面.结果表明:采样充芯连铸法工艺可以连续稳定地制备铜包铝双金属棒,包覆层厚度均匀.     

Vapor Phase Dealloying Derived Nanoporous Co@CoO/RuO2 Composites for Efficient and Durable Oxygen Evolution Reaction (Adv. Funct. Mater. 17/2023)

The development of low-cost and effective oxygen evolution reaction (OER) electrocatalysts to expedite the slow kinetics of water splitting is crucial for increasing the efficiency of energy conversion from electricity to hydrogen fuel. Herein, 3D bicontinuous nanoporous Co@CoO/RuO₂ composites with tunable sizes and chemical compositions are fabricated by introducing vapor phase dealloying of cobalt-based alloys. The influence of physical parameters on the formation of nanoporous Co substrates with various feature ligament sizes is systematically investigated. The CoO/RuO₂ shell is constructed by integrating a thin layer of RuO₂ on the inner surface of nanoporous Co, where the CoO interlayer is formed by annealing oxidization. The composite catalyst delivers an ultralow overpotential of 198 mV at 10 mA cm⁻², Tafel slope of 57.1 mV dec⁻¹, and long-term stability of 50 h. The superior OER activity and fast reaction kinetics are attributed to charge transfer through the coupling of Co O Ru bonds at the interface and the excellent nanopore connectivity, while the durability originates from the highly stable CoO/RuO₂ interface.     

Nanoporous Superalloy Membranes: A Review

The ability to produce metallic membrane materials with porosity on the nanoscale from Ni‐based superalloys, hitherto used exclusively for high temperature applications, has been discovered 15 years ago. The basic principle is to first convert the initial γ/γ′ microstructure, containing isolated γ′‐precipitates, into a bi‐continuous network where both phases are in themselves continuous and interpenetrate each other. Then, one of the two phases is selectively removed, so that a rigid structure consisting of the remaining phase with pores on the location of the removed phase results. This article reviews the progress made so far. In that time period, a number of ways to fabricate these unique materials have emerged, utilizing 1) single crystals and polycrystals as precursor materials as well as 2) coarsening of coherent and incoherent γ′‐precipitates to realize bi‐continuity of the microstructure. Consequently, a family of superalloy membranes has emerged with specific microstructures, properties, advantages, and limitations. It is the intention of this article to give an overview on these various manufacturing routes, as well as on resulting microstructures and properties. Finally, possible fields of applications are outlined. It is demonstrated that the particular manufacturing process from a solid to the porous material leads to certain advantages, such as the ability to structure the material in porous and solid areas as required by the application.