日本金属学会誌

J. Japan Inst. Metals, Vol. 65, No. 12 (2001),
pp. 1045-1052

Superplastic Forming of Continuous Fiber Reinforced Titanium Matrix Composites

Takeshi Yamada, Hiroaki Sato and Takayuki Tsuzuku

Nagoya Aerospace Systems, Mitsubishi Heavy Industries, Ltd., Nagoya 455-8515

Abstract:

Sprayed preforms were fabricated with Ti-4.5Al-3V-2Mo-2Fe alloy (SP-700) powder of 23{~}53 μm diameter instead of conventional powder of 23{~}150 μm diameter to make the microstructure of the sprayed deposit fine. SCS-6/SP-700 composite made of the improved sprayed preforms (improved spray composite) showed superplasticity in the tensile direction perpendicular to the fiber with a maximum m-value of 0.58 at 1048 K. The tensile flow stress of the improved spray composite was a little lower than that of SCS-6/SP-700 composite made of woven preforms. Tensile strength at room temperature of the improved spray composite after deformation was comparable to that of the improved spray composite before deformation. Stringer- and blade-shaped TMC part models are demonstrated to be successfully superplastic-formed. No debonding defects at fiber/matrix interface were observed in the blade-shaped model using the improved spray composite.


(Received September 5, 2001)

Keywords:

titanium matrix composite, titanium alloy, silicon carbide, superplastic forming, sprayed preform, plasma spray, tensile strength, microstructure, stringer, blade


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