Unravelling the combined effect of cooling rate and microalloying on the microstructure and tribological performance of Cu50Zr50
Unravelling the combined effect of cooling rate and microalloying on the microstructure and tribological performance of Cu50Zr50
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DOI：
10.1016/j.wear.2022.204276
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发表时间：
2022-02
期刊：
影响因子：
5
通讯作者：
A. Younes;H. Izadi-Gonabadi;R. M. Sánchez;S. Bull;S. González
中科院分区：
文献类型：
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作者：
A. Younes;H. Izadi-Gonabadi;R. M. Sánchez;S. Bull;S. González
本文研究了真空吸铸Cu_（50）Zr_（50）、Cu_（49.5）Zr_（50）Fe_（0.5）和Cu_（49）Zr_（50）Fe_（10）的冷却速度和微合金化的联合作用。%直径为2 mm和4 mm的棒。对于2 mm的试样，冷却速度≥ 1000 K/s时，组织主要由B2 CuZr奥氏体组成，且各成分的组织基本相同。0.5在。% Fe的添加促进了在磨损测试时应力诱导的B19'马氏体的形成，从而改善了合金的耐磨性。对于4 mm的试样，在冷却速率为250 K/s时，以多相金属间化合物为主，当微合金化温度为0.5at. % Fe时，形成相对大体积分数的铸态B33 CuZr马氏体，从而导致耐磨性降低。在高冷却速率下，磨损机制主要是分层磨损，而在低冷却速率下，大的连续凹槽指示磨粒磨损。
The combined effect of the cooling rate and microalloying has been studied from suction casted Cu50Zr50,Cu49.5Zr50Fe0.5and Cu49Zr50Fe1at. % rods of 2 mm and 4 mm diameter. For the 2 mm samples, ∼1000 K/s cooling rate, the microstructure mostly consists of B2 CuZr austenite and it is basically the same for all compositions. However, 0.5 at. % Fe addition promotes the formation of stress-induced B19’ martensite upon wear testing thus improving the wear resistance of the alloy. For the 4 mm samples, ∼250 K/s cooling rate, a multiphase intermetallic is predominant and when microalloyed with 0.5 at. % Fe, a relatively large volume fraction of as-cast B33 CuZr martensite is formed thus resulting in a reduction of the wear resistance. At high cooling rate the wear mechanism is predominantly delamination wear while for low cooling rate the large continuous grooves are indicative of abrasive wear.