Peak shift direction

[ResidualStressMan]

When measuring the peak shift thru the x-ray diffraction technique, does a higher 2theta angle indicate compressive or tensile stress?
Please explain.

[Robert]

Peaks will shift to higher 2theta if the material is in compression. Under tension the peaks will shift to lower 2 theta.

lambda = 2dsin(theta). Since lambda is fixed (usually K-alpha x-ray) , if the d spacing increases (tension) then the sin(theta) has to decrease to keep lambda constant.

Peak shifts are quite small usually less than 1 degree even for a highly stressed material.

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[spilyt710]

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