金属铍静态再结晶行为  

Static Recrystallization Behavior of the Metal Beryllium

作　　者：许德美 李美岁 代彦明 叶树鹏 何力军 李峰 Xu Demei;Li Meisui;Dai Yanming;Ye Shupeng;He Lijun;Li Feng(School of Materials Science and Engineering,Key Laboratory of Powder Material&Advanced Ceramics,International Scientific&Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials,North Minzu University,Yinchuan 750021,China;State Key Laboratory for Special Rare Metal Materials,Northwest Rare Metal Materials Research Institute Ningxia Co.,Ltd,Shizuishan 753000,China;Key Laboratory of Ningxia for Photovoltaic Materials,Ningxia University,Yinchuan 750021,China)

机构地区：[1]北方民族大学,材料科学与工程学院,粉体材料与特种陶瓷省部共建重点实验室,工业废弃物循环利用及先进材料国际科技合作基地,宁夏银川750021 [2]西北稀有金属材料研究院宁夏有限公司,稀有金属特种材料国家重点实验室,宁夏石嘴山753000 [3]宁夏大学宁夏光伏材料重点实验室,宁夏银川750021

出　　处：《稀有金属材料与工程》2022年第8期2971-2978,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51874246);宁夏自然科学基金(2018AAC03225)。

摘　　要：通过热压缩和真空退火实验研究了金属铍低温形变(应变温度350℃,应变速率10^(-3)s^(-1),应变量30%)后在680~880℃温度区间退火组织演变规律。结果表明:金属铍具有独特的静态再结晶行为,再结晶晶粒首先在{10_12}<10_1_1>拉伸孪晶界处形核,机理为应变诱导的孪晶界弓出形核。晶界“弓出”形核落后于孪晶界“弓出”形核的原因是BeO杂质对原始晶粒晶界钉扎,阻碍了其界面的迁移。孪晶界和原始晶粒晶界“弓出”形核是金属铍主要的形核方式,晶内直接形核和杂质处形核是其次要的形核方式。低温形变铍在680~880℃内退火均能够获得晶粒细化的完全再结晶组织,且没有再结晶织构形成。金属铍的再结晶晶粒不易长大,原因也是由于BeO杂质对晶界迁移的钉扎作用。在680,730,780,830和880℃退火,完成再结晶时间分别大约为2160,180,20,5和4 min。金属铍350℃下压缩发生{0001}基面滑移和{10_12}类孪晶变形,形变机理与室温相同,没有随温度升高而发生改变,仍保持金属铍特有的反常变形行为。The microstructure evolution of beryllium which was deformed at the temperature of 350 ℃ and the strain rates of 110^(-3)s^(-1) was studied during annealing by hot compression and vacuum annealing experiment. The annealing temperature is from 680 to 880 ℃. The results show that the metal beryllium has a unique static recrystallization behavior. The new grains first nucleate at the {10■2}<10■> tensile twin boundaries, and the mechanism is strain-induced twin boundary bulge nucleation. The pinning effect of BeO impurities on the prior grain boundary migration is the reason why the twin boundary bulge nucleation precedes to the grain boundary bulge nucleation. The twin boundary bulge nucleation and grain boundary bulge nucleation are the main nucleation mechanism of the metal beryllium static recrystallization, supplemented with intragranular nucleation and the particle stimulated nucleation of recrystallization. When annealed from 680 ℃ to 880 ℃, the beryllium deformed at 350 ℃ low temperature is able to achieve complete recrystallization microstructure of grain refinement, no recrystallization texture is formed in the recrystallization microstructure. Similarly, the recrystallization grains of the metal beryllium are difficult to grow due to the pinning effect of BeO impurities on grain boundary migration. Annealing at 680, 730, 780, 830 and 880 ℃, the recrystallization time is about 2160, 180, 20, 5 and 4 min, respectively. The metal beryllium occurs {0001} basal plane slip and {10■2}<10■> twin deformation under compression at 350 ℃. The deformation mechanisms are the same as that at room temperature, no change occurs with the increasing temperature, and the metal beryllium keeps typical abnormal deformation behaviors.

关 键 词：金属铍 静态再结晶 孪晶界 弓出形核 BeO杂质 

分 类 号：TG146.24[一般工业技术—材料科学与工程]