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Unformatted text preview: ome anneal time t,
A1=area 1 = amount of A removed from x>0
A2=area 2 = amount of A transported to x<0
A3=area 3 = amount of B removed from x<0
A4=area 4 = amount of B transported to x>0
Noting that the molar volume of the bar is constant, it follows that the position of
the Matano interface remains a constant distance from the end of the bar.
Relative to a fixed plane in space, there is a net transfer of matter to A-B side for
the couple. In order to conserve volume, this means that the A-B side is growing
and the pure A side is shrinking. Thus, Matano interface is shifted left side in upper
i) the velocity of marker is given by
v (D A D B ) A
Thus, if D A D * , D A D B , v=0.
B C A
C 3D B A
Thus the markers placed at the highest concentration gradient move fastest.
C C B
v 3D B A 3D B B ,
Markers move to the right side. ii) D * 4D * , D A 4D B , v (4D B D B )
Take a look at markers in A-B alloy. The markers move to the right, but
isoconcentration points move to the left. Markers don’t move with
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This document was uploaded on 11/26/2013.
- Fall '13