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Elongation of CoCrMo: what is the difference between 5D and A5

Elongation of CoCrMo: what is the difference between 5D and A5

Elongation of CoCrMo: what is the difference between 5D and A5

(OP)
I am researching alloys used in dentistry, such as CoCrMo and NiCrMo. Some manufacturers describe elongation as 5D (%) and others as A5 (%). Are they the same? I am familiar with 5D but not A5. I have noticed that elongation when descibed as A5 seems to have a higher value for the same material? Help please?

RE: Elongation of CoCrMo: what is the difference between 5D and A5

The definition of A5 is the permanent extension of the gauge length after fracture, expressed as a percentage of the original gauge length L0 where L0 is taken equal to 5.65 x S0 and S0 is the initial cross-section of the test piece.
 

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