摘要
以高纯钨粉和高纯X粉为原料,通过放电等离子烧结技术(SPS)制备了不同X含量的W-X合金材料,并结合X射线衍射仪、扫描电镜、透射电镜等分析手段,研究X含量对W-X合金材料微观组织及强韧性的影响。结果表明:W-X合金材料的主要相组成为W-X固溶体和X的氧化产物X2O5;X元素的加入改变了纯钨的变形机制,在螺位错的基础上,出现了刃位错;随着X含量的增加,X固溶到钨晶粒中的比例逐渐增大,晶粒尺寸发生长大;随着X含量的增加,W-X合金材料的相对密度先增加后趋于稳定,压缩强度呈现先增大后减小的规律;当X含量为30%(质量分数)时,W-X合金呈现最佳性能,压缩强度达2044 MPa,压缩应变达24%。
W-X alloy was prepared by spark plasma sintering(SPS)with high purity tungsten powder and X powder.The effect of X content on the solid solution characteristics and strength and toughness of W-X alloy was studied by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and energy dispersive spectroscopy(EDS).The results show that the main phases of the W-X alloy are W-X solid solution and X2O5.The addition of X changes the deformation mechanism of pure tungsten.On the basis of screw dislocation,the edge dislocations appear.The amount of X solid solution into tungsten grain increases gradually with the increase of X content.The grain size grows up with the increase of X content,which seriously reduces the mechanical properties of the W-X alloy.The relative density of the W-X alloy gradually increases with the increase of X content.The compressive strength of W-X alloy first increases and then decreases with the increase of X content.When the X content is 30%(mass fraction),the performance of W-X is the best,the compressive strength is 2044 MPa and the fracture strain is 24%.
作者
刘文扬
黄宇峰
蔡青山
段欣昀
张勇
刘文胜
马运柱
LIU Wen-yang;HUANG Yu-feng;CAI Qing-shan;DUAN Xin-yun;ZHANG Yong;LIU Wen-sheng;MA Yun-zhu(National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials,Central South University,Changsha 410083,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2021年第7期1707-1716,共10页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51931012)
关键词
高强
高韧
钨
固溶体
放电等离子烧结
high strength
high toughness
tungsten
solid solution
spark plasma sintering
作者简介
通信作者:刘文胜,教授,博士,电话:0731-88877998,E-mail:liuwensheng@csu.edu.cn;通信作者:马运柱,教授,博士,电话:0731-88877825,E-mail:zhuzipm@csu.edu.cn。
