More info
Description / Abstract:
Introduction
Note: Nothing in this standard supercedes
applicable laws and regulations. Note: In the event of conflict
between the English and domestic language, the English language
shall take precedence.
Purpose. This standard covers the process for
determining and reporting the microstructural fineness of aluminum
castings. Two (2) methods are presented in this standard:
Method A (Appendix A). Secondary Dendrite Arm
Spacing (SDAS) as measured via the linear intercept method.
Method B (Appendix B). Mean Linear Dendrite
Spacing (MLDS) as measured via an image analysis routine.
Applicability. This standard applies only to
aluminum castings which have well defined dendrite arms evident in
the microstructure. It is not suitable for characterization of near
eutectic, eutectic or hypereutectic aluminum alloys.
Remarks. These methods provide a quantitative
representation of the two dimensional (2-D) microstructure of
hypoeutectic aluminum castings. It is important to note that these
two (2) methods will not produce identical results.