(西安理工大學(xué) 材料科學(xué)與工程學(xué)院，西安 710048)
摘 要: 以乙醇為過程控制劑，采用機械球磨方法制備W-10%Ti(質(zhì)量分?jǐn)?shù))、W-10%TiH2納米晶W-Ti粉末，晶粒粒徑為30~80 nm，粉體經(jīng)壓制后在1 823 K保溫?zé)Y(jié)80 min得到W-Ti合金。利用X射線衍射、透射電鏡和掃描電鏡等手段，研究球磨時間對兩種粉末及其燒結(jié)試樣的相組成和微觀組織的影響；測量燒結(jié)試樣的密度和顯微硬度。結(jié)果表明：機械合金化能夠降低燒結(jié)溫度，提高燒結(jié)體的密度，組織均勻且晶粒細(xì)小；利用W-TiH2球磨粉制備的W-Ti合金與W-Ti粉相比密度較高且晶粒細(xì)小。
關(guān)鍵字: W-Ti合金；機械合金化；密度；顯微硬度
properties of W-Ti alloy
（School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China）
Abstract: W-Ti nanocrystalline alloying powders of 30−80 nm with composition of W-10%Ti (mass fraction) and W-30% TiH2 were prepared by mechanical milling in alcohol media. The W-Ti alloy was prepared by pressing and sintered at 1 823 K for 80 min using W-Ti powders. The phase constituent and microstructure of the powders and alloy billets were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The density and micro-hardness of the alloy billets were also measured. The results show that mechanical alloying is helpful to decrease the sintering temperature and increase the density. The microstructure of the alloys is well-proportioned and the size of crystal is small. The alloy prepared by W-TiH2 powders has higher density than W-Ti powders, and its particle size is finer.
Key words: W-Ti alloy; mechanical alloying; density; micro-hardness
