Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Backscattered electron micrograph of the hot-pressed HP4 cross-section; (b) secondary electron micrograph of the fracture surface at low magnification; (c) fracture surface at higher magnification reveals striations and layered structure of grains.
