K. Sivaprasad

TL;DR: In this paper, a low cost system of Al 6063 − x TiB 2 ( x ǫ= 0, 5, 10 ¼ ) in situ metal matrix composites were prepared by the reaction mixture of K 2 TiF 6 and KBF 4 with molten alloy.

TL;DR: In this article, the crystallite size, lattice strain, deformation stress, and strain energy density of AA 6061 matrix were determined precisely from the first five most intensive reflection of X-ray diffraction (XRD) and transmission electron microscopy (TEM).

TL;DR: In this paper, AA 6351-xZrB2 [x = 0, 3, 6 and 9 weight percentage (wt%)] in situ composites have been prepared by the reaction of mixture of K2ZrF6 and KBF4 with molten aluminium alloy at a reaction temperature of 850°C.

Abstract: Joining of commercially pure Ti to 304 stainless steel by fusion welding processes possesses problems due to the formation of brittle intermetallic compounds in the weld metal, which degrade the mechanical properties of the joints. Solid-state welding processes are contemplated to overcome these problems. However, intermetallic compounds are likely to form even in Ti-SS joints produced with solid-state welding processes such as friction welding process. Therefore, interlayers are employed to prevent the direct contact between two base metals and thereby mainly to suppress the formation of brittle Ti-Fe intermetallic compounds. In the present study, friction-welded joints between commercially pure titanium and 304 stainless steel were obtained using a thin nickel interlayer. Then, the joints were characterized by optical microscopy, scanning electron microscopy, energy dispersive spectrometry, and X-ray diffractometry. The mechanical properties of the joints were evaluated by microhardness survey and tensile tests. Although the results showed that the tensile strength of the joints is even lower than titanium base metal, it is higher than that of the joints which were produced without nickel interlayer. The highest hardness value was observed at the interface between titanium and nickel interlayers indicating the formation of Ni-Ti intermetallic compounds. Formation these compounds was validated by XRD patterns. Moreover, in tensile tests, fracture of the joints occurred along this interface which is related to its brittle nature.

TL;DR: In this article, the relationship between the components of powders, namely, the powder surface morphology, the flow characteristics and the compressibility of low-energy and high-energy ball milled powders of Al 6061 alloy reinforced with TiO2 particles was investigated by using the scanning electron microscope (SEM).