Journal Published Online: 02 October 2023
Volume 12, Issue 1

Compressive Flow Behavior and Microstructural Evolution of Friction Stir Processed A356-5% B 4 C Composite



An Al-7Si-0.3Mg (A356) alloy reinforced with 5 % boron carbide (B4C) particulates was produced through squeeze casting technique at a temperature of 710°C. Friction stir processing (FSP) was employed on an A356-5% B4C composite with optimized parameters, viz., tool advancing speed of 15 mm/min and tool rotation speed of 250 r/min for one pass and two passes. High-temperature flow behavior of the FSPed A356-5% B4C composite was investigated by strain rate jump (1 × 10−3 to 5 × 10−1 s−1) compression tests using a thermomechanical simulator at temperatures of 470°C and 500°C. Strain rate jump tests revealed superplastic region with strain rate sensitivity index m = 0.4 in the lower strain rate regime of 1 × 10−3 to 5 × 10−2 s−1. However, the value of m reduced to 0.3 upon two-pass FSP. The reduction in m is attributed to the more uniform redistribution of hard Si particles throughout the composite, as examined by microstructure evolution in scanning electron microscopy, linked with energy-dispersive spectroscopy and electron-backscattered diffraction facility.

Author Information

Gangolu, S.
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Sabirov, I.
IMDEA Materials Institute, Madrid, Spain
Gourav Rao, A.
Naval Materials Research Laboratory, India
Prabhu, N.
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai, India
Kashyap, B. P.
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, India
Pages: 10
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Stock #: MPC20220079
ISSN: 2379-1365
DOI: 10.1520/MPC20220079