摘要
The evolution of microstructure and microhardness was studied in a commercial tungsten-25%rhenium(mass fraction)(W-25Re)alloy processed by the high pressure torsion(HPT)procedure under a pressure of7.7GPa up to10revolutions at different temperatures.The results show that the samples processed by10revolutions at room temperature could have the smallest grain size at around0.209μm.High saturation hardness(HV^1200)could be achieved after the rapid strengthening stage for samples processed by10revolutions both at room temperature and at573K.Microstructural observation and analysis from Hall-Patch relationship could reveal that grain refinement and grain boundaries strengthening are the main factors of hardening mechanism in W-25Re alloy.It is also demonstrated that sintered W-25Re sample may have brittle phase separation phenomenon after HPT processing.
研究W-25Re(质量分数,%)合金在7.7 GPa下经历不同温度10圈高压扭转变形(HPT)的微观组织和显微硬度。结果表明,在室温下经历10圈HPT变形的试样平均晶粒尺寸达到了极小值(约0.209μm);且在室温和573 K温度下经历10圈HPT变形的试样均获得极高的平均硬度(约HV 1200)。通过观察试样的微观结构,并结合Hall-Patch公式进行分析,发现晶粒细化和晶界强化是HPT形变W-25Re合金硬化的主要因素,并推断出烧结态W-25Re试样在HPT过程中存在脆性相析出。
作者
Chen-hao QIAN
Zi-yang HE
Cheng LIANG
Wei-xi JI
钱陈豪;贺子阳;梁辰;吉卫喜(江南大学机械工程学院,无锡214122;江南大学江苏省食品先进制造装备技术重点实验室,无锡214122;Industrial and Manufacturing System Engineering Department, Iowa State University, Ames, Iowa 50011, United States;School of Engineering, University of Liverpool, Brownlow Hill, Liverpool L69 3GH, United Kingdom)
基金
Project(11402264)supported by the National Natural Science Foundation of China
Project(BK20160182)supported by the Natural Science Foundation of Jiangsu Province,China
Projects(JUSRP116027,JUSRP51732B)supported by the Fundamental Research Funds from Jiangnan University,China
