Investigation on single/double pass friction stir processing techniques of nickel 200 alloy

Abstract

Due to the increasing demand for high-strength materials in the world, the researcher’s interest in moving towards the search for new processes and/or materials to achieve the goal. To address the issue friction stir processing (FSP) was applied to Nickel 200 alloy to study the consequences of the single-pass and double-pass approaches. The evolving microstructure and mechanical properties after each successive FSP pass were studied. The tensile response and hardness were studied for both approaches at particular process parameters of 400 rpm rotational speed and 90 mm/min traverse velocity. The peaks in the XRD pattern shift towards a lower angle in the double pass process compare to that of the single-pass process. The average crystalline size of a double pass increased as compared to that a single pass. Microhardness, as well as tensile strength, is higher for single-pass process samples compare to that of double-pass process samples.