(淮陰工學(xué)院 機械與材料工程學(xué)院，淮安 223003)
摘 要: 采用銷-盤式磨損試驗機對比研究兩種典型雙相鈦合金TC4和TC11合金在不同滑動速度下的磨損行為，并探討了磨損機制。結(jié)果表明：TC4合金的磨損率隨滑動速度加快和載荷增加而增長，滑動速度為4 m/s時，同載荷下的磨損率達到了最高值；而TC11合金的磨損率隨滑動速度加快先增加，在滑動速度為2 m/s時達到最高值然后開始下降，在4 m/s時取得最低值。載荷30 N時，TC4合金在滑動速度為1~4 m/s時的磨損機制主要為輕微粘著磨損、磨粒磨損和剝層磨損；TC11合金在滑動速度為1~2 m/s時的磨損機制為輕微粘著磨損、磨粒磨損和剝層磨損，在3 m/s時的為氧化磨損和磨粒磨損，但在4 m/s時的為氧化輕微磨損。兩種鈦合金在滑動速度為1~2 m/s時的磨損行為與磨損機制相似。但高速下，穩(wěn)定摩擦氧化物層的存在顯著降低了TC11合金的磨損率；而TC4合金由于硬度相對較低，對摩擦氧化物層的支撐作用不足，磨損率快速增長。
關(guān)鍵字: 鈦合金；磨損行為；磨損機制；摩擦氧化物層
（Faculty of Mechanical and Material Engineering, Huaiyin Institute of Technology, Huaian 223003）
Abstract:Dry sliding wear behaviors of TC4 and TC11 duplex alloys were comparatively studied at various sliding velocities on a pin-on-disc tester. The wear mechanisms were also discussed. The results show that the wear rate of TC4 alloy increases with increasing the load and sliding velocity, and then reaches the maximum value at 4 m/s under an identical load. For TC11 alloy, the wear rate firstly increases as a function of sliding velocity, obtains the climax at 2 m/s, then gradually decreases at 3 m/s, and ultimately acquires the minimum value at 4 m/s. For TC4 alloy, the mild adhesion, abrasion and delamination prevails at 1-4 m/s. However, the main mechanisms for TC11 alloy were mild adhesive, abrasive and delamination wear at 1-2 m/s, oxidative and abrasive wear at 3 m/s, and oxidative mild wear at 4 m/s. By contrast, two alloys share the similar wear behaviors and mechanisms at 1-2 m/s. But at a high sliding velocity, the existence of a stable tribo-oxide layer is responsible for the reducing wear rate of TC11 alloy. For TC4 alloy, the rapidly increasing wear rate can be attributed to the low hardness and insufficient support on tribo-oxide layer from the substrate.
Key words: titanium alloy; wear behavior; wear mechanism; tribo-oxide layer
