Automatic metallographic preparation of low-concentration, directionally solidified lead-tin alloys

The preparation for metallographic examination of lead and lead alloys, especially of low alloy concentrations, is very difficult to accomplish. The problems that occur are not common to most other materials. Lead alloys tend to deform, smear, and even recrystallize during preparation. Embedded particles and scratches are common problems. The slightest deformation will be hardly detectable in other materials but will be very obvious in lead. Because of these problems, careful attention must be given to the abrasive process. A successful method has been developed for obtaining clean metallographic specimens of low tin concentration alloys.