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TECHNICAL PAPERS

Development of Short Fiber-Reinforced NiTiAl6061 Composite

[+] Author and Article Information
C. L. Xie1

 Noveltech, Inc., 40500 Ann Arbor Rd., Plymouth, MI 48170noveltech@sbcglobal.net

M. Hailat

 Noveltech, Inc., 40500 Ann Arbor Rd., Plymouth, MI 48170

X. Wu

Department of Mechanical Engineering,  Wayne State University, Detroit, MI 48202

G. Newaz

Department of Mechanical Engineering,  Wayne State University, Detroit, MI 48202gnewaz@eng.wayne.edu

M. Taya

Center for Intelligent Materials and Systems,  University of Washington, Seattle, WA 98195tayam@u.washington.edu

B. Raju

 U.S. Army TARDEC, 6501 E 11 Mile Road, MS, Warren, MI 48397basavaraju.raju@us.army.mil

1

Corresponding author.

J. Eng. Mater. Technol 129(1), 69-76 (Jun 04, 2006) (8 pages) doi:10.1115/1.2400271 History: Received October 03, 2005; Revised June 04, 2006

The aluminum matrix composite reinforced by short NiTi shape memory alloy fibers, NiTiAl6061 composite, was fabricated using pressure-assisted sintering process in ambient air. Surface preparation and thermal pretreatment of NiTi fibers essential for solid state bonding of TixAly intermetallic compound were carried out. Strong interface bonding between NiTi fiber and Al6061 matrix was obtained. The strengthening mechanism of shape memory effect associated with short fiber reinforcement was theoretically examined by extending Taya’s previous model. The stress–strain behavior of the short fiber-reinforced NiTiAl6061 composite was investigated at room and elevated temperature both experimentally and analytically. In order to activate the shape memory effect, the composite was prestrained at a temperature between martensite start temperature Ms and austenite start temperature As, then yield stresses as a function of the prestrain were tested and predicted at a temperature above the austenite finish temperature Af. It was found that: (1) the yield stress of the composite increased with increasing the amount of prestrain; (2) the prestrain value should not exceed 0.01, to make use of strengthening of the composite without loss of the ductility of the matrix; and (3) failure of the composite was caused by the strength mismatch between the NiTi fiber and aluminum matrix.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

DSC heat flow curves during heating and cooling of the NiTi fibers: (a) as-received; (b) heattreated.

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Figure 2

Stress–strain curves of SM495 NiTi fibers

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Figure 3

Stress–strain curves of the NiTi∕Al6061 composite and monolithic Al6061 alloy, tested room temperature without prestraining

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Figure 4

Optical micrograph of NiTi∕Al6061 composite. The black area on the upper-left is part of the crosssection of a NiTi fiber.

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Figure 5

Tensile fracture of NiTi∕Al6061 composite

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Figure 6

Bending fracture of NiTi∕Al6061 composites with the use of: (a) etched fibers; (b) unetched fibers

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Figure 7

SEM micrograph of the fracture surface of a NiTi∕Al6061 composite specimen with the use of pre-etched fibers. One embedded fiber is shown. The specimen failed by uniaxial tension.

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Figure 8

Stress–temperature diagram of a NiTi fiber and typical path of fiber from processing temperature to tensile test

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Figure 9

Analytical model for calculating residual stresses and strains in both SMA fiber and metal matrix: (a) original problem, which is converted to (b) Eshelby’s equivalent inclusion problem

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Figure 10

Experimental stress–strain curves of NiTi∕Al6061 composite at 85°C with different prestrain values.

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Figure 11

Normalized yield stresses of NiTi∕Al6061 composite as a function of the prestrain

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Figure 12

Yield stress of NiTi∕Al6061 composite as a function of SMA fiber volume fraction and temperature. All the specimens experienced 0.01 prestrain.

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Figure 13

Computed yield strength of NiTi∕Al6061 composite as a function of SMA fiber aspect ratio and temperature

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