Friction and wear properties of ultrafine grain Ti-8Mo-3Fe alloys fabricated by MA-SPS
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摘要: 以機械合金化+放電等離子燒結（MA-SPS）制備的超細晶Ti-8Mo-3Fe合金為研究對象，研究了合金在模擬體液（SBF）中的摩擦磨損性能，并與放電等離子燒結制備的微米尺寸晶粒的Ti-8Mo-3Fe合金、鑄造純Ti及Ti-6Al-4V （TC4）合金進行了對比.結果表明：采用MA-SPS工藝可制備出高致密度、組織均勻的超細晶Ti-8Mo-3Fe合金，合金由β相及少量α相組成，平均晶粒尺寸為1.5 μm，顯微硬度為448 HV；在相同摩擦磨損條件下，超細晶Ti-8Mo-3Fe合金的摩損程度明顯低于微米晶粒Ti-8Mo-3Fe和鑄態的純Ti及TC4合金，具有最低的磨損體積和較穩定的摩擦系數.超細晶Ti-8Mo-3Fe合金的磨損機制為磨粒磨損，而微米晶粒Ti-8Mo-3Fe和鑄態純Ti及TC4合金的磨損機制為磨粒磨損和黏著磨損并存的混合磨損.Abstract: The friction and wear properties of ultrafine grain Ti-8Mo-3Fe alloy fabricated by mechanical alloying (MA) and subsequent spark plasma sintering (SPS) were investigated in SBF simulated body fluid. It was compared with those of as-SPSed micron size grain Ti-8Mo-3Fe alloy and as-casted Ti and TC4 alloy. The results show that ultrafine grain Ti-8Mo-3Fe alloy with high density and uniform microstructure can be fabricated by MA-SPS, and the alloy mainly consists of β-Ti phase and a small amount of α-Ti phase. The average grain size is 1. 5 μm, and the microhardness is 448 HV. In the same wear condition, the wear degree of ultrafine grain Ti-8Mo-3Fe alloy is significantly lower than those of micro-crystalline Ti-8Mo-3Fe, as-casted Ti, and TC4 alloy, so it has the lowest wear volume and stable friction coefficient. Ultrafine grain Ti-8Mo-3Fe alloy is mainly characterized by abrasive wear, but micro-crystalline Ti-8Mo-3Fe, as-casted Ti and TC4 alloy are characterized by abrasive and adhesion wear.
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Key words:
- titanium alloys /
- mechanical alloying /
- friction and wear of materials /
- wear mechanisms
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參考文獻
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