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Sheng Liu, Qing Yuan, Yutong Sima, Chenxi Liu, Fang Han, and Wenwei Qiao, Wear behavior of Zn–38Al–3.5Cu–1.2Mg/SiCp composite under different stabilization treatments, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp.1270-1279. https://dx.doi.org/10.1007/s12613-020-2217-7
Sheng Liu, Qing Yuan, Yutong Sima, Chenxi Liu, Fang Han, and Wenwei Qiao, Wear behavior of Zn–38Al–3.5Cu–1.2Mg/SiCp composite under different stabilization treatments, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp.1270-1279. https://dx.doi.org/10.1007/s12613-020-2217-7
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Zn–38Al–3.5Cu–1.2Mg/SiCp复合材料稳定化处理下的磨损行为

摘要: 高铝锌合金由于其高温耐磨性较差而受限于各种重型传动领域的使用,碳化硅增强体的加入有效改善了当前的困境。然而以高铝锌合金为基体的复合材料仍然有明显的时效缺陷,且随着重载长程传动的持续而引起摩擦温度剧增,复合材料摩擦表面微观组织中固溶体的溶解度增大,耐磨α相和减摩η相均向软基β相转换引起了微观结构的不稳定,从而导致摩擦工况中复合材料使用性能的不稳定。本文采用搅拌联合熔体超声工艺制备了纳米Zn–38Al–3.5Cu–1.2Mg/SiCp复合材料试样,研究了不同稳定化处理下复合材料的干摩擦磨损行为,分析了磨损性能与磨损量、磨损表面形貌、纳米增强体的分散性以及复合材料微观组织结构的关系。研究结果表明,稳定化的复合材料内部的纳米SiCp分布更加均匀,经稳定化处理后的复合材料的显微硬度随着接触表面温度的升高而在增大,未经过稳定化处理的复合材料显微硬度随着接触表面温度升高基本不变,并且稳定化工艺最优为380℃ × 6 h + 170℃ × 48 h。稳定化处理有利于复合材料中纳米增强体颗粒的分散,不仅细化了晶粒大小还增强了耐磨性,同时由于纳米SiCp的高温热稳定性还进一步抑制了在磨损时复合材料微观结构中硬质相向软质相的转变过程,同时稳定化处理也有利于缓解纳米SiCp在基体界面处所引起的裂纹源。

 

Wear behavior of Zn–38Al–3.5Cu–1.2Mg/SiCp composite under different stabilization treatments

Abstract: A Zn–38Al–3.5Cu–1.2Mg composite reinforced with nano-SiCp was fabricated via stirring-assisted ultrasonic vibration. To improve the abrasive resistance of the Zn–38Al–3.5Cu–1.2Mg/SiCp composite, several stabilization treatments with distinct solid solutions and aging temperatures were designed. The results indicated that the optimal stabilization treatment for the Zn–38Al–3.5Cu–1.2Mg/SiCp composite comprised solution treatment at 380°C for 6 h and aging at 170°C for 48 h. The stabilization treatment led to the formation of dispersive and homogeneous nano-SiCp. During the friction wear condition, the nano-SiCp limited the microstructure evolution from the hard α(Al,Zn) phase to the soft β(Al,Zn) phase. Moreover, the increased amount of nano-SiCp improved the grain dimension and contributed to the composite abrasive resistance. Furthermore, the stabilization treatment suppressed the crack initiation and propagation in the friction wear process, thereby improving the abrasive resistance of the Zn–38Al–3.5Cu–1.2Mg/SiCp composite.

 

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