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Metals 2015, 5(3), 1695-1703; doi:10.3390/met5031695

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
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Academic Editor: Anders E. W. Jarfors
Received: 20 July 2015 / Revised: 21 August 2015 / Accepted: 24 August 2015 / Published: 16 September 2015
(This article belongs to the Special Issue Casting Alloy Design and Modification)
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Abstract

NiAl bronze (NAB) alloy is prepared by using friction stir processing (FSP) technique at a tool rotation rate of 1200 rpm and a traverse speed of 150 mm/min. A post heat treatment is performed at the temperature of 675 °C. The effect of heat treatment on the microstructure and microhardness is studied. The results show that the microstructure of the FSP NAB alloy consists of high density dislocations, retained β phase (β′ phase) and recrystallized grains. When annealed at 675 °C, discontinuous static recrystallization (DSRX) takes place. The content of β′ phase gradually decreases and fine κ phase is precipitated. After annealing for 2 h, both the microhardness of the FSP sample in the stir zone (SZ) and the difference in hardness between the SZ and base metal decrease due to the reduction of the dislocation density and β′ phase, accompanying recrystallized grain coarsening. With further increasing of the annealing time to 4 h, the aforementioned difference in hardness nearly disappears. View Full-Text
Keywords: NiAl bronze (NAB); friction stir processing (FSP); heat treatment; micro-hardness NiAl bronze (NAB); friction stir processing (FSP); heat treatment; micro-hardness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lv, Y.; Wang, L.; Xu, X.; Lu, W. Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy. Metals 2015, 5, 1695-1703.

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