(西北工業(yè)大學(xué) 航空學(xué)院， 西安 710072)
摘 要: 研究了Ti811（Ti8Al1Mo1V）鈦合金表面離子束增強(qiáng)沉積(IBED)0Cr18Ni9膜層的膜基界面成分分布、 膜基結(jié)合強(qiáng)度、 膜層硬度和摩擦學(xué)行為。 利用噴丸形變強(qiáng)化對(duì)IBED膜層進(jìn)行后處理， 擬達(dá)到聯(lián)合提高鈦合金高溫微動(dòng)疲勞抗力的目的。 結(jié)果表明： 離子束增強(qiáng)沉積技術(shù)可以獲得致密度高， 晶粒細(xì)化，孔隙率低， 膜基結(jié)合強(qiáng)度高的0Cr18Ni9膜層， 從而顯著提高了鈦合金表面硬度和耐磨性能； 離子束增強(qiáng)沉積0Cr18Ni9膜層的耐磨性能與噴丸形變強(qiáng)化引入的表層殘余壓應(yīng)力協(xié)同作用， 使Ti811合金在350 ℃高溫下的微動(dòng)疲勞抗力顯著提高， 并且高于噴丸強(qiáng)化或IBED膜層的單獨(dú)作用。
關(guān)鍵字: 鈦合金； 微動(dòng)疲勞； 復(fù)合表面改性； 高溫； 噴丸強(qiáng)化； 離子束增強(qiáng)沉積
（School of Aeronautics, Northwestern Polytechnical University,
Xi'an 710072, China）
Abstract: The 0Cr18Ni9 film was deposited on Ti 811 titanium alloy surface by ion-beam-enhanced deposition (IBED). The composition distribution, bonding strength, hardness and the wear resistance of the film were investigated. Shot peening was introduced to post treat the modified surface in order to synergistically improve the fretting fatigue resistance of Ti alloy. The results indicate that IBED can prepare 0Cr18Ni9 film with high density, small grain size, low void radio and high bonding strength. Thus the hardness, wear resistance and fretting fatigue resistance of Ti 811 alloy are increased remarkably. Compared with shot peening treatment or ion-beam-enhanced deposition coating alone, the titanium alloy after IBED 0Cr18Ni9 combined shot peening shows high fretting fatigue resistance at elevated temperature of 350 ℃. This is due to the synergistic effect of the high wear resistance of the film surface and the residual compressive stress induced by shot peening.
Key words: titanium alloy; fretting fatigue; duplex surface modification; elevated temperature; shot peening; ion beam enhanced deposition
