Abstract. Commonly used materials for accelerator components are those which are vacuum compatible and thermally conductive. Stainless steel, aluminum and copper are common among them. Stainless steel is a poor heat conductor and not very common in use where good thermal conductivity is required. Aluminum and copper and their alloys meet the above requirements and are frequently used for the above purpose. The accelerator components made of aluminum and its alloys using welding process have become a common practice now a days. It is mandatory to use copper and its other grades in RF devices required for accelerators. Beam line and Front End components of the accelerators are fabricated from stainless steel and OFHC copper. Fabrication of components made of copper using welding process is very difficult and in most of the cases it is impossible. Fabrication and joining in such cases is possible using brazing process especially under vacuum and inert gas atmosphere. Several accelerator components have been vacuum brazed for Indus projects at Raja Ramanna Centre for Advanced Technology (RRCAT), Indore using vacuum brazing facility available at RRCAT, Indore. This paper presents details regarding development of the above mentioned high value and strategic components/assemblies. It will include basics required for vacuum brazing , details of vacuum brazing facility, joint design, fixturing of the jobs, selection of filler alloys, optimization of brazing parameters so as to obtain high quality brazed joints, brief description of vacuum brazed accelerator components etc.
Aluminum composites are growing in demand as an advanced material in aerospace industries, automobile industries, marine applications and structural applications. In the current work, an attempt has been made to study the mechanical properties of the monolithic AA6061 alloy, it’s composite by reinforcing B4C (4wt%) particles and T6 heat treated composite on the same ground. Al6061-B4C composite was developed by stir casting method and uniform distribution of particles were observed throughout the bulk which was confirmed by SEM-EDS. Subsequently T6 heat treatment was done on composite. Reinforcement in the matrix increase the hardness value of base alloy by 21.3%. The hardness value of heat-treated Al6061-B4C composite was found to be increased by 20.5% than that of non-heat-treated composite which may be due to formation of coherent Mg2Si precipitates. The presence of B4C particles and gas porosity in the matrix of aluminum alloy tend to decrease the value of impact strength of composite and heat-treated composite.
The application of aluminium-based composite is increasing day by day in structural and aerospace engineering sectors due its exceptional properties such as higher strength to weight ratio, excellent mechanical properties, and high corrosion resistance. In the current study the Metal Matrix Composite (MMC) with Aluminum alloy (AA) 6061 as matrix and steel mesh as reinforcement was fabricated by two routes. First, by hot rolling the steel mesh sandwiched between two 3 mm thick AA 6061 sheets and second by the pouring of AA 6061 over and below the steel mesh placed in horizontal plane in a sand mold such that the mesh gets completely incorporated at the centre of casting subsequently hot rolling them to obtain MMC. One specimen obtained by each route was given T6-heat treatment (HT). The microstructural study was done to characterize the composites formed and their mechanical properties such as hardness and tensile strength were compared with HT cast-rolled and HT rolled sheets of same thickness. The superior Ultimate tensile strength of 155.4MPa was shown by samples obtained by HT cast-rolled sheet with steel mesh sample than other samples.
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