Superplasticity at high strain rates in a SiC Whisker reinforced A1 alloy

An EBSD and TEM Study on the Microstructural Evolution of <I>in situ</I> Synthesized (TiB+TiC)&frasl;Ti Matrix Composites during Superplastic Deformation

“…Schuh and Dunand [9][10][11][12] studied the transformation superplasticity of TiB/Ti-6Al-4V composite with the result of the maximum elongation of 260%, which focused on the transformation superplasticity (internal-stress superplasticity). The high strain rate superplasticity of aluminum matrix reinforced with SiC was discovered by Nieh et al 13) in 1984 and a continuous recovery and recrystallization mechanism was proposed 14,15) for superplasticity in large-grained FeAl alloys. In this paper the microstructure evolution during superplastic deformation of in situ synthesized ðTiB þ TiCÞ=Ti matrix composite is investigated.…”

“…In these maps, black lines represent grain boundary with a misorientation angle between 2 and 10 , which should be small angle grain-boundary, blue lines represent grain boundaries with misorientation angle of , whereas red lines for higher than 30 . Because the amount of [10][11][12][13][14][15] grain-boundary is few, blue and red lines should be regarded as high angle grain-boundaries. The area surrounded by black lines reduced a little, which indicated the amount of small angle grain-boundary decreased a little during superplasitic deformation, whereas the amount of high angle grain-boundary increased.…”

The Critical Stress at the Interface for Cavity Nucleation in Superplastic Aluminum Matrix Composites Reinforced with Si<SUB>3</SUB>N<SUB>4</SUB> Particles

“…[1][2][3][4][5][6][7] However, if cavitation is limited in a temperature range below the partial melting temperature, large elongation can be attained without the accommodation helper process by liquid. 3,4) Actually, a large elongation of 221% was attained at 773 K which was below the partial melting temperature of 821 K for Si 3 N 4p /AlMg composites.…”

OBSERVATION OF CAVITATION FORMATION IN A SUPERPLASTIC Si3N4p/Al-Mg-Si COMPOSITE AT HIGH STRAIN RATES

“…Recently, many aluminum matrix composites with discontinuous SiC or Si3N4 are reported to show superplastic behavior [8][9][10][11][12][13][14][15]. In particular, it should be noted that some composites exhibited superplastic behavior at high strain rates of more than 10-2s-1.…”