Influence of grain size on mechanical properties of
isostatically pressed beryllium materials①
isostatically pressed beryllium materials①
(1. Northwest Rare Metal Materials Research Institute, Shizuishan 753000, P.R.China;
2. State Key Laboratoryfor P/M, Central South University of Technology, Changsha 410083, P.R.China)
2. State Key Laboratoryfor P/M, Central South University of Technology, Changsha 410083, P.R.China)
Abstract: Six kinds of beryllium powders with different particle sizes (4~15μm) and low oxygen prepared by impact grinding were compacted and consolidated by cold-hot isostatic pressing (CIP-HIP). The tensile strength, yield strength, elongation and micro-yield strength(MYS) of the materials were tested and it showed that the strength of the materials, especially the yield strength and micro yield strength(MYS) increase obviously with the refinement of grain size. From the XRD and TEM, the second phase is BeO which is finely dispersed in matrix. This is considered to be the main strengthening mechanism for CIP-HIPed beryllium materials with higher purity.
Key words: beryllium; mechanical property; grain size