WTi10合金的高温高压制备及相特征

High Temperature & High Pressure Preparation and Phase Characterization of WTi10 Alloy

采用高温高压工艺制备了WTi10合金。使用电子探针、扫描电子显微镜及X射线衍射仪等手段研究制备工艺对合金密度及微观组织的影响,尤其是合金中的相演变特征。评价靶材对合金相的要求,并据此获取优化的制备工艺。研究表明,温度是制备WTi10合金密度的主要影响因素,合金的密度随温度升高而增大;温度高于1250℃的合金中为完全固溶生成的体心立方β相,其中主要包含W颗粒、富钨β(W,Ti)及富钛β1(W,Ti)3种成分;钨钛合金靶材要求其中富钛相β1越少越好,富钨β(W,Ti)相占比也不宜过高,故其加工温度应该在1400和1500℃之间,保压保温时间则与加工温度成反比关系,加压压力≥15 MPa。

High temperature & high pressure forming technique was used for the preparation of WTi10 alloy. The density and microstructure of alloys were analyzed by electron probe microanalysis, scanning electron microscope and X-ray diffraction, especially the evolution of phase. In addition, the effect of phase differences on sputter target and the optimal processing parameters were researched. The results indicate that temperature is the most important factor affecting the density of prepared WTi10 alloy. The density of alloy increases with increasing temperature. When the temperature is above 1250 °C, the microstructure mainly consists of β phase with body-centered cubic which includes mainly the W particle, W-rich β(W, Ti) and Ti-rich β1(W, Ti). Sputter target demands that the less the β1 phase and β phase, the better the quality of alloy. As a result, the optimum processing temperature is between 1400 and 1500 °C. The time of high temperature & high pressure forming process is inversely proportional to the temperature. And the pressure ≥15 MPa.