Background
Metallic or ceramic coatings are often
applied to protect or strengthen an underlying base material. Microstructural
analysis of such materials in cross-section by EBSD requires that the contact
between the substrate and the coating is planar, and the true structure of both
phases is undistorted and continuous to the surface. Specimens with porous
substrate materials are especially challenging to prepare because of the
increased risk of pulling out grains and retaining coarse polishing particles
inside the pores that cause scratches during subsequent polishing steps.
Instruments Used
Gatan PECS™ II Broad Beam Ion Mill and EDAX
Hikari Super EBSD System with APEX™ 2.0 Software
Materials and Methods
After routine mechanical polishing, a
porous ZnAl alloy with a dual-layer copper plating was mounted in the PECS II
and milled using 5kV Ar ions at an incident angle of 3° for 30 min, followed by
60 min with 4 kV. The long duration was required to remove an oxide layer from
the ZnAl matrix material. Some scratches are still visible in the softer Cu
coating, but milling was stopped to minimize side-milling of the coating and
pores. After milling, the surface of both materials was flat and suitable for
EBSD mapping.
자세한 사항은 첨부파일 확인 부탁 드립니다.
감사합니다.
(주)로티스코리아 올림