(1. 東北大學(xué) 材料各向異性與織構(gòu)教育部重點實驗室，沈陽110004；
2. 西北稀有金屬材料研究院 寧夏自治區(qū)特種材料重點實驗室，石嘴山 753000)
摘 要: 研究熱等靜壓金屬鈹材中BeO雜質(zhì)分布狀態(tài)和顆粒尺寸對金屬鈹力學(xué)性能的影響，并通過設(shè)計真空退火試驗，進一步調(diào)控BeO雜質(zhì)在鈹基體中的分布，得出BeO雜質(zhì)形態(tài)與分布對力學(xué)性能的影響規(guī)律。結(jié)果表明：相比于BeO含量，BeO雜質(zhì)的分布和形態(tài)對金屬鈹力學(xué)性能的影響更為關(guān)鍵；當(dāng)BeO粒子彌散分布時，位于晶界上BeO粒子的尺寸及間距是決定金屬鈹材強度與塑性的關(guān)鍵因素，粗大的BeO粒子(粒徑大于300 nm)是導(dǎo)致鈹材塑性低的主要原因之一；三叉晶界不致密BeO聚集態(tài)相當(dāng)于在材料內(nèi)部預(yù)制一定尺寸的微裂紋，也是影響鈹材伸長率的主要因素。
關(guān)鍵字: BeO；Be; 三叉晶界；應(yīng)力集中；塑性
（1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,
Northeastern University, Shenyang 110004, China;
2. Key Laboratory for Rare Materials, Ningxia Province, Northwest Rare Metal Materials Research Institute,
Shizuishan 753000, China）
Abstract:The effects of the morphology and distribution of BeO impurity on the mechanical properties of metal beryllium in the powder hot isostatic pressed (HIPed) metal beryllium and the vacuum annealed ones were studied, and the general conclusions were obtained. The results show that the morphology and distribution of BeO impurity play more important roles than the BeO content in controlling mechanical properties of beryllium. When BeO particles monodisperse distribution in the beryllium matrix, BeO particle size and interparticle distance along the grain boundaries of Be are key factors to affect the strength and ductility of Be material, and BeO with size larger than 300 nm is the main reason of poor ductility of Be. BeO particles at the triple grain boundary junctions of Be, which is equivalent to the pre-fabricated microcracks inside, mainly lead to poor ductility of Be material.
Key words: BeO; Be; triple grain boundary junction; stress concentration; ductlity
