Showing papers by "Srinivasa R. Bakshi published in 2020"
TL;DR: A review of the tensile properties of carbon nanotube reinforced aluminium matrix (Al-CNT) composites can be found in this article, where various processing routes for fabrication of AlCNT composites have been compared in terms of the resulting microstructure, degree of CNT dispersion, extent of interfacial reaction and its effect on the tensil properties.
118 citations
TL;DR: In this article, W-Cu composites up to six layers have been developed using high energy ball milling and spark plasma sintering (SPS) at a lower temperature of 900°C.
26 citations
TL;DR: In this paper, the extruded and heat treated ODS Fe3Al exhibited both elongated and fine equi-axed grain structure in longitudinal direction, whereas, equiaxedgrain structure was observed in transverse direction, the improved strength and elongation are due to the presence of dispersoids and fine grained structure.
19 citations
TL;DR: In this paper, wire arc additive deposition of Stellite 6 alloy was carried out using cold metal transfer (CMT) process and the microstructural features, microhardness, and high temperature mechanical properties were studied.
12 citations
TL;DR: In this article, friction stir welding of 3-mm-thick AA6061-T6 Al alloy and AZ31B-H24 Mg alloy sheets was carried out in lap configuration with Al alloy on top.
Abstract: In the present work, friction stir welding of 3-mm-thick AA6061-T6 Al alloy and AZ31B-H24 Mg alloy sheets was carried out in lap configuration with Al alloy on top. Experiments were carried out by varying the pin length (3.25, 3.75, and 4.25 mm) and tool rotation speed (600, 800, and 1000 RPM). Microstructures of the joint cross-section revealed the presence of a compound intermetallic layer along the interface consisting of Al-rich (Al3Mg2) intermetallic compound near the Al alloy side, and Mg-rich intermetallic compound (Mg17Al12) near the Mg alloy side. The formation of a eutectic mixture of Mg solid solution and Mg17Al12 was observed at the hook on either side. Two modes of failure were observed; Mode 1 through the interface and Mode 2 due to failure of the sheet. The Mode 1 failure strengths obtained were the highest (148 ± 6 N/mm) compared to the literature and were obtained for the 3.25 and 3.75 mm pin at 800 RPM. A lap shear strength of 212 ± 6 N/mm was obtained with 4.25 mm pin length at 600 RPM, which is the highest reported so far and was attributed to Mode 2 failure. The effect of interface pull-up, angle of the interface at the advancing side, and distribution of intermetallic compounds on the lap-shear strength are discussed.
9 citations
20 Jul 2020
TL;DR: In this paper, the effect of carbon addition to CoCrFeMnNi is discussed at different length scales starting from the lattice level to the micro-structural level and finally at the macro-mechanical level.
Abstract: Equiatomic CoCrFeMnNi high entropy alloy has been very well-known in scientific community as a material offering outstanding structural properties at a wide range of temperature. To realize this potential, interstitial alloying with various elemental additions has been employed in the past. Carbon has been the primary and the most popular interstitial addition to CoCrFeMnNi so far. This review summarizes the large body of work which has been done to establish the structural benefits of carbon addition to CoCrFeMnNi. The effect of carbon addition to CoCrFeMnNi is discussed at different length scales starting from the lattice level to the microstructural level and finally at the macro-mechanical level. At the lattice level, the effect of carbon addition on stacking fault energy and its effect on deformation mechanisms like TWIP and TRIP are discussed. The effect of carbide precipitation on the microstructure is reviewed at the microstructural level, along with the concurrent changes in mechanical properties like strength, hardness, and strain hardening rate at the macro level. In the second part of this review, the effect of 2 wt.% graphite flake addition on the microstructure of CoCrFeMnNi synthesized by mechanical alloying and spark plasma sintering is presented.
3 citations
TL;DR: In this paper, the authors evaluated the thermal stability of a nanocrystalline Mg alloy and found that the Mg-Mo alloy is not expected to be thermally stable due to the tendency of Mo to exist as a separate phase.
3 citations