退火处理对Mo-47.5Re合金箔材σ相显微形貌的影响  

Effect of Annealing Treatment on σ-Phase Characteristics of Mo-47.5Re Alloy Foil

作　　者：李艳 陈文帅 周增林 何学良[1] 惠志林 Li Yan;Chen Wenshuai;Zhou Zenglin;He Xueliang;Hui Zhilin(GRIMAT Engineering Institute Co.,Ltd,Beijing 101407,China;State Key Laboratory of Advanced Materials for Smart Sensing,GRINM Group Co.,Ltd,Beijing 100088,China;General Research Institute for Nonferrous Metals,Beijing 100088,China)

机构地区：[1]有研工程技术研究院有限公司,北京101407 [2]有研科技集团有限公司智能传感功能材料国家重点实验室,北京100088 [3]北京有色金属研究总院,北京100088

出　　处：《稀有金属材料与工程》2023年第2期433-440,共8页Rare Metal Materials and Engineering

基　　金：National Key R&D Program of China(2017YFB0306000)。

摘　　要：以粉末冶金烧结坯为原料,通过多道次轧制和中间退火得到厚度分别为0.035和0.030 mm的Mo-47.5Re箔材(质量分数,%)。在1300~1900℃氢气退火后,采用金相显微镜、扫描电镜和能谱分析仪分析了退火温度对σ相特性的影响。EDS分析表明:第二相的Mo:Re原子比在ND方向接近1:1,在RD方向接近或低于1:2,因此Mo-47.5Re箔内绝大多数第二相是σ相;但RD方向第二相的Mo:Re原子比相对较低,甚至接近1:4。钼铼合金箔材的特点是晶粒大、变形孪晶少、晶粒中的σ相颗粒比晶界处尺寸大、数量多。随着退火温度的升高,0.035和0.030 mm厚箔材中σ相的数量先增加后减少。1300℃退火后,0.035 mm箔材的σ相数量达到最大值,尺寸显著减小,而0.030 mm样品在1500℃退火后出现这种现象。1900℃退火后,0.030 mm样品的RD方向残留少量小尺寸σ相颗粒,ND方向和0.035 mm样品的RD和ND方向的σ相颗粒全部重新回溶并消失。在轧制态和相对低温退火样品中,如1300℃,大部分σ相颗粒为不规则的多边形形貌,少数为球形。在1500℃及更高温度下退火后,一些样品中的σ相颗粒呈立方体形貌。Using powder metallurgy sintered billet as raw material, Mo-47.5Re(wt%) foils with the thicknesses of 0.035 and 0.030 mm were obtained by multi-pass rolling and intermediate annealing. After hydrogen annealing at 1300 – 1900 ℃, metallurgical microscopy, SEM and EDS were used to analyze the effect of annealing temperature on characteristics of σ-phase. EDS analysis indicates that Mo:Re atomic ratio of second phase in the ND direction approaches to 1:1, and that in the RD direction is close to or lower than 1: 2, so the majority of second phase in Mo-47.5Re foils is σ-phase;but Mo: Re atomic ratio of second phase in the RD direction is relatively low, even reaching 1:4. The micrograph characteristics of Mo-47.5Re foil includes large grains, few deformation twins, and larger and more σ-phase particles in grains than at the grain boundary. The number of σ-phase in 0.035 and 0.030 mm thick foils increases first and then decreases with rasing annealing temperature. After annealing at 1300 ℃, σ-phase number of 0.035-mmsample reaches the maximum and the grain size is significantly reduced, while 0.030-mm-sample shows this phenomenon at 1500 ℃. After annealing at 1900 ℃, a few small-sized σ-phase particles remain in the RD direction of 0.030-mm-sample, and all σ-phase particles in the ND direction of 0.030-mm-sample and those in RD and ND directions of 0.035-mm-sample are totally redissolved and disappear. In as-rolled and relatively low-temperature annealed samples, such as 1300 ℃, most σ-phase particles have irregular polygonal morphology, and a few of them are spherical. After annealing at 1500 ℃ and higher temperatures, σ-phase particles in some samples exhibit a cube shape.

关 键 词：Mo-47.5Re合金 轧制变形 Σ相 退火温度 显微形貌 

分 类 号：TG156.2[金属学及工艺—热处理] TG146.412[金属学及工艺—金属学]