摘要
试验采用放电等离子体烧结(SPS)工艺,在烧结温度1600~1900℃、保温0~15 min下制备了W-10Ta合金,分析了材料的组织、性能及晶粒长大动力学。结果表明:钨和钽在烧结过程中形成了单相W-Ta固溶体,且随着烧结温度和保温时间的增加,W-10Ta合金的衍射角向低角度偏移。W-10Ta合金的断裂方式为穿晶断裂和沿晶断裂组合而成的脆性断裂。随着烧结温度和保温时间的增加,W-10Ta合金的致密度和剪切强度增加。在低温(1600~1700℃)下,W-10Ta合金的晶粒尺寸变化不大,在高温(1800~1900℃)下,W-10Ta合金的晶粒明显长大。此外,W-10Ta合金的晶粒长大系数为n=2,晶粒长大主要以晶界扩散为主。在保温时间5 min、10 min、15 min下,W-10Ta合金晶粒生长的活化能分别为359.26 kJ/mol,378.65 kJ/mol和373.76 kJ/mol。
The W-10Ta alloys were prepared by SPS under the sintering temperatures of 1600~1900℃and the holding times of 0~15 mins,and the microstructure,properties and the grain growth kinetics of the obtained alloys were studied.The results show that tungsten and tantalum form a single-phase W-Ta solid solution during the sintering process,and the diffraction angle of W-10Ta alloys shifts to lower angles with the increase of sintering temperature and holding time.The fracture mode of W-10Ta alloys is brittle fracture combined with transgranular fracture and intergranular fracture.With the sintering temperature and holding time increasing,both the density and shear strength of W-10Ta alloy improved.At low temperatures(1600~1700℃),the grain size of W-10Ta alloys changes insignificantly,while at high temperatures(1800~1900℃),significant grain grow occurres.In addition,the grain growth coefficient of W-10Ta alloys is n=2 and the grain growth is dominated mainly by the grain boundary diffusion.The activation energies of grain growth under holding times of 5 min,10 min,15 min are calculated as 359.26 kJ/mol,378.65 kJ/mol and 373.76 kJ/mol,respectively.
作者
刘大伟
张久兴
王玥皓
黄蕾
潘亚飞
LIU Dawei;ZHANG Jiuxing;WANG Yuehao;HUANG Lei;PAN Yafei(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)
出处
《中国钨业》
CAS
2023年第4期64-70,共7页
China Tungsten Industry
基金
国家重点研发计划(2018YFC1901700)。
