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Infiltration of A6063 aluminium alloy into SiC-B_4C hybrid preforms using vacuum assisted block mould investment casting technique

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Transactions of Nonferrous Metals Society of China 2012年第7期22卷 1563-1567页

作者： Alptekin KISASOZ Kerem Altug GULER ahmet karaaslan Department of Metallurgy and Materials Engineering Yildiz Technical UniversityDavutpasa CampusTR 34210EsenlerIstanbulTurkey

Production of A6063/SiC-B4C hybrid composite using vacuum assisted block mould investment casting was investigated. Firstly,SiC-B4C hybrid preforms were fabricated in cylindrical *** preferred mean particle size of the SiC and B4C powders were 60μm and 55μm *** early experiments,single powder ratio of 85%SiC and 15%B4C was selected to produce the tough ***,the preforms were placed into the cylindrical shape gypsum bonded block investment moulds and A6063 alloy was infiltrated into the preforms using vacuum assisted（-10 5 Pa）casting *** fraction of preforms was determined using Archimedes’*** fabricated cast specimens were characterized using hardness tests,image analysis and SEM observations and EDX *** result indicates that,by the vacuum assisted block mould investment casting technique,the infiltration of the preforms by molten metal was successfully realized.

关键词： AlMMC SiC B4C investment casting hybrid preform

Cooling slope casting of AA7075 alloy combined with reheating and thixoforging

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Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2237-2244页

作者： Kerem Altug GULER Alptekin KISASOZ Gokhan OZER ahmet karaaslan Department of Metallurgical and Material Engineering Yildiz Technical UniversityTR34210IstanbulTurkey Aluminium Test Training and Research Center(ALUTEAM)Fatih Sultan Mehmet Vakif UniversityTR34445Halic CampusIstanbulTurkey

Cooling slope casting has been applied to aluminium casting alloys for producing ingots with non-dendritic ***-solid forming of the AA7075 was studied via cooling slope casting,reheating and thixoforging processes in order to determine the effect of semi-solid casting on the microstructure of the ***7075 ingots with non-dendritic microstructure were produced with cooling slope *** were characterized by light microscopy,image analysis,scanning electron microscopy and EDS *** resulting structures are promising in terms of grain size and *** was realized that grain coarsening may occur very suddenly in the reheating *** slope castings were obtained with 30°and 60°inclination angles,and in comparison,60°castings showed better ***,by using short reheating periods,semi-solid forging causes trace formation in the solid grains.

关键词： semi-solid alloy cooling slope casting thixoforging AA7075 alloy

Influence of T6 heat treatment on A356 and A380 aluminium alloys manufactured by thixoforging combined with low superheat casting

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Transactions of Nonferrous Metals Society of China 2018年第3期28卷 385-392页

作者： Ridvan GECU Serhat ACAR Alptekin KISASOZ Kerem ALTUG GULER ahmet karaaslan Department of Metallurgical and Materials Engineering Yildiz Technical UniversityDavutpasa Campus

The effects of T6 heat treatment on thixoforged A356 and A380 aluminium alloys were *** superheat casting(LSC)technique was carried out to prepare proper specimens for thixoforging *** samples were poured at 20°C above their liquidus temperatures which provided the formation of equiaxed grains instead of dendritic *** billets were reheated for varied time from 20 to 80 min and thixoforged with 50%deformation *** thixoforging process,the samples were T6 heat treated for both A356 and A380 *** microstructural evaluation and hardness alteration of thixoforged,solution treated and aged specimens were examined comparatively by using optical microscopy,scanning electron microscopy with energy-dispersive X-ray spectroscopy and Brinell hardness equipment.T6 heat treatment provided relatively uniform microstructure with newly formed precipitates that are Mg2Si and Al2Cu for A356 and A380 billets,***,hardness after artificial aging was increased considerably and reached HB 93 for A356 and HB 120 for A380 alloys.

关键词： T6 heat treatment thixoforging low superheat casting aluminium alloy