【作者】 刘海彦； 贾文鹏； 刘延斌； 贺卫卫； 汤慧萍； 刘咏；

【Author】 Haiyan LIU1,Wenpeng JIA1,Yanbin LIU2,Weiwei HE1,Huiping TANG1,Yong LIU2 1State Key Laboratory for Porous Metals Materials,Northwest Institute for Nonferrous Metal Research,Xi’an,China,710016 2State Key Laboratory for Powder Metallurgy,Central South University,Changsha,China,410083

【机构】 西北有色金属研究院； 中南大学粉末冶金国家重点实验室；

【摘要】 用元素混合法研究了粉末冶金Ti-Fe-Mo-Y系合金的烧结、热变形行为及力学性能。粉末冶金Ti-Fe-Mo-Y合金中稀土元素钇在烧结过程中对钛粉末表面氧有净化作用,促进了钛粉末的致密化过程,烧结相对密度可以达到97%以上。烧结态显微组织分析表明,增加稀土钇后合金晶粒细化,合金室温拉伸强度不变,而塑性得到改善,提高合金的变形能力。经热变形后,添加Y元素合金的韧窝数量明显多于基体合金,韧窝中存在的Y2O3颗粒是提高合金强度的重要原因之一。更多还原

【Abstract】 P/M Ti-Fe-Mo-Y alloys with different Rare-earth Y Content are prepared by blend element method,its sintering and hot deformation behaviors are studied together with microstructure and mechanical properties. The microstructures and properties of the alloying titanium were testified by the analysis of Optical microscopy(OM) ,X-ray diffraction(XRD) ,scanning electron microscopy(SEM) .The result indicated that Y element absorbs free oxygen and purify the Ti powder surface,promoting densification process. With appropriate vacuum and temperature,the blend element metal powder sintering relative density can reach more than 97%. Microstructure and mechanical properties analysis shown that Y element composed Y2O3 particles which refine grains and improve plasticity,elevate alloy distortion ability. After hot deformation,grains crashed and flow line appears,the mechanical properties of Ti-Fe-Mo-Y alloy prompted which also validated by large amount of dimples appear in tensile fracture surface.更多还原