Microstructures and microhardness evolutions of melt-spun Al-8Ni-5Nd-4Si alloy

Journal Article · Thu Mar 15 00:00:00 EDT 2012 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2012.01.002· OSTI ID:22066425

Karakoese, Ercan ^[1]; Keskin, Mustafa ^[2]

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1. Karatekin University, Faculty of Sciences, Department of Physics, 18100 Cank Latin-Small-Letter-Dotless-I r Latin-Small-Letter-Dotless-I (Turkey)
2. Erciyes University, Faculty of Sciences, Department of Physics, 38039 Kayseri (Turkey)

Al-Ni-Nd-Si alloy with nominal composition of Al-8 wt.%Ni-5 wt.%Nd-4 wt.%Si was rapidly solidified by using melt-spinning technique to examine the influence of the cooling rate/conditions on microstructure and mechanical properties. The resulting conventional cast (ingot) and melt-spun ribbons were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy together with energy dispersive spectroscopy, differential scanning calorimetry, differential thermal analysis and Vickers microhardness tester. The ingot alloys consists of four phases namely {alpha}-Al, intermetallic Al{sub 3}Ni, Al{sub 11}Nd{sub 3} and fcc Si. Melt-spun ribbons are completely composed of {alpha}-Al phase. The optical microscopy and scanning electron microscopy results show that the microstructures of rapidly solidified ribbons are clearly different from their ingot alloy. The change in microhardness is discussed based on the microstructural observations. - Highlights: Black-Right-Pointing-Pointer Rapid solidification allows a reduction in grain size, extended solid solution ranges. Black-Right-Pointing-Pointer We observed the matrix lattice parameter increases with increasing wheel speed. Black-Right-Pointing-Pointer Melt-spun ribbons consist of partly amorphous phases embedded in crystalline phases. Black-Right-Pointing-Pointer The solidification rate is high enough to retain most of alloying elements in the Al matrix. Black-Right-Pointing-Pointer The rapid solidification has effect on the phase constitution.

• OSTI ID: 22066425
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: Complete Vol. 65; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
AMORPHOUS STATE
CALORIMETRY
DIFFERENTIAL THERMAL ANALYSIS
FCC LATTICES
GRAIN SIZE
LATTICE PARAMETERS
MATRIX MATERIALS
MICROHARDNESS
NEODYMIUM ALLOYS
NICKEL ALLOYS
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
SILICON ALLOYS
SOLID SOLUTIONS
SOLIDIFICATION
VICKERS HARDNESS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY