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The table below shows the behavior of an aluminum-based composite reinforced with SiC whiskers under creep conditions: One of the ways to assess the effect

The table below shows the behavior of an aluminum-based composite reinforced with SiC whiskers under creep conditions:

image text in transcribed

One of the ways to assess the effect of reinforcements is based on the relationship:

image text in transcribed

where image text in transcribed is a coefficient (for the matrix image text in transcribed=0), image text in transcribedc is the secondary strain rate of the composite, image text in transcribedm corresponds to the secondary strain rate of the matrix and n is the stress exponent of the matrix. Considering that the main creep mechanism is associated with non-conservative movement of dislocations, calculate the coefficient image text in transcribed for the strain of 116 Ma at 423 and 477K knowing that the secondary rates for pure aluminum at 116 MPa correspond to 1.412 x 10-8 (1/s) and 2.310 x 10-4 (1/s), respectively. What is the physical meaning of the coefficient image text in transcribed?

T(K) 423 O (MPa) 116 139 164 225 70 80 100 135 19 28 33 43 (1/s) 2,772 x 109 1,054 x 10-7 8,920 x 102 1,802 x 105 3,803 x 10-9 2,345 x 10-8 4,738 x 10-7 1,213 x 10-5 1,246 x 10-8 3,190 x 10-2 3,423 x 10-6 1,538 x 105 477 533 , (1- B)" PI T(K) 423 O (MPa) 116 139 164 225 70 80 100 135 19 28 33 43 (1/s) 2,772 x 109 1,054 x 10-7 8,920 x 102 1,802 x 105 3,803 x 10-9 2,345 x 10-8 4,738 x 10-7 1,213 x 10-5 1,246 x 10-8 3,190 x 10-2 3,423 x 10-6 1,538 x 105 477 533 , (1- B)" PI

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