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Tensile Properties and Microstructures of a 2024-T351 Aluminum Alloy Subjected to Cryogenic Treatment
Metals - Tập 6 Số 11 - Trang 279
Jianzhong Zhou, Suqiang Xu, Shu Huang, Xiankai Meng, Jie Sheng, Haifeng Zhang, Jing Li, Yunhui Sun, Emmanuel Agyenim-Boateng
The aim of this study was to investigate the effects of the cryogenic treatment (CT) using liquid nitrogen on tensile properties and microstructures of the 2024-T351 aluminum alloy. Tensile tests were carried out, and tensile fractures were observed using a scanning electron microscope (SEM). The microstructure evolution of 2024-T351 subjected to CT was also studied using both an optic mic...... hiện toàn bộ
Ultrasonic and Conventional Fatigue Endurance of Aeronautical Aluminum Alloy 7075-T6, with Artificial and Induced Pre-Corrosion
Metals - Tập 10 Số 8 - Trang 1033
Ishvari F. Zuñiga Tello, Marijana Milković, Gonzalo M. Domínguez Almaraz, Nenad Gubeljak
Ultrasonic and conventional fatigue tests were carried out on the AISI-SAE AA7075-T6 aluminum alloy, in order to evaluate the effect of artificial and induced pre-corrosion. Artificial pre-corrosion was obtained by two hemispherical pitting holes of 500-μm diameter at the specimen neck section, machined following the longitudinal or transverse direction of the testing specimen. Induced pre...... hiện toàn bộ
Processing and Properties of Aluminum and Magnesium Based Composites Containing Amorphous Reinforcement: A Review
Metals - Tập 5 Số 2 - Trang 743-762
S. Jayalakshmi, Sankaranarayanan Seetharaman, Manoj Gupta
This review deals with the processing and properties of novel lightweight metal matrix composites. Conventionally, hard and strong ceramic particles are used as reinforcement to fabricate metal matrix composites (MMCs). However, the poor mechanical properties associated with the interfacial de-cohesion and undesirable reactions at (ceramic) particle–(metallic) matrix interface represent ma...... hiện toàn bộ
Influence of Batch Mass on Formation of NiTi Shape Memory Alloy Produced by High-Energy Ball Milling
Metals - Tập 11 Số 12 - Trang 1908
Tomasz Goryczka, Piotr Salwa
A high-energy ball milling technique was used for production of the equiatomic NiTi alloy. The grinding batch was prepared in two quantities of 10 and 20 g. The alloy was produced using various grinding times. Scanning electron microscopy, X-ray diffraction, hardness measurement and differential scanning calorimetry were used for materials characterization at various milling stages. The pr...... hiện toàn bộ
The Origins of High-Entropy Alloy Contamination Induced by Mechanical Alloying and Sintering
Metals - Tập 10 Số 9 - Trang 1186
Igor Moravčík, Antonín Kubíček, Larissa Moravcikova-Gouvea, Ondřej Adam, V. Kaňa, Václav Pouchlý, Antonín Záděra, Ivo Dlouhý
One of the prevailing problems for materials produced by powder metallurgy is contamination from various sources. This work deals with the influence of process parameters and presence of process control agents (PCA) on the contamination level of materials produced by means of mechanical alloying (MA) technology, densified with spark plasma sintering (SPS). The equiatomic CoCrFeNi high-entr...... hiện toàn bộ
Synergism Red Mud-Acid Mine Drainage as a Sustainable Solution for Neutralizing and Immobilizing Hazardous Elements
Metals - Tập 11 Số 4 - Trang 620
Hugo Lucas, Srečko Stopić, Buhle Xakalashe, Sehliselo Ndlovu, Bernd Friedrich
Acid mine drainage (AMD) and red mud (RM) are frequently available in the metallurgical and mining industry. Treating AMD solutions require the generation of enough alkalinity to neutralize the acidity excess. RM, recognized as a waste generating high alkalinity solution when it is in contact with water, was chosen to treat AMD from South Africa at room temperature. A German and a Greek RM...... hiện toàn bộ
Review on Friction Stir Processed TIG and Friction Stir Welded Dissimilar Alloy Joints
Metals - Tập 10 Số 1 - Trang 142
Sipokazi Mabuwa, Velaphi Msomi
There is an increase in reducing the weight of structures through the use of aluminium alloys in different industries like aerospace, automotive, etc. This growing interest will lead towards using dissimilar aluminium alloys which will require welding. Currently, tungsten inert gas welding and friction stir welding are the well-known techniques suitable for joining dissimilar aluminium all...... hiện toàn bộ
A Critical Review of Mg-Based Hydrogen Storage Materials Processed by Equal Channel Angular Pressing
Metals - Tập 7 Số 9 - Trang 324
Wang Lisha, Jinghua Jiang, Aibin Ma, Yuhua Li, Dan Song
As a kind of cost-efficient hydrogen storage materials with high hydrogen capacity and light weight, Mg-based alloys have attracted much attention. This review introduces an effective technique in producing bulk ultrafine-grained (UFG) Mg alloys and promoting its hydrogen storage property, namely, equal-channel angular pressing (ECAP). This paper briefly describes the technical principle o...... hiện toàn bộ
Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining
Metals - Tập 9 Số 2 - Trang 198
Peng Xue, Yang Zou, Peng He, Yinyin Pei, Huawei Sun, Chaoli Ma, Jingyi Luo
The microstructure and properties of a Cu/304 stainless steel dissimilar metal joint brazed with a low silver Ag16.5CuZnSn-xGa-yCe braze filler after aging treatment were investigated. The results indicated that the addition of Ce could reduce the intergranular penetration depth of the filler metal into the stainless steel during the aging process. The minimum penetration depth in the Ag16...... hiện toàn bộ
Extracting Al2O3 and TiO2 from Red Mud Smelting Separation Slag by Alkali and Acid Leaching Methods
Metals - Tập 13 Số 3 - Trang 552
Siwei Li, Zhengqi Guo, Jian Pan, Deqing Zhu, Tao Dong, Shenghu Lu
Recovery of valuable metals from red mud smelting separation slag is important for environmental protection and saving of natural resources. In this paper, we propose a recycling process of red mud smelting separation slag by mineral phase reconstruction conducted under an air atmosphere. In this process, NaOH and Ca(OH)2 roasting of Al2O3 and NaAlSiO4 was performed, and Al2O3 and SiO2 wer...... hiện toàn bộ
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