Design of quasicrystal alloys with favorable tribological performance in view of microstructure and mechanical properties
Design of quasicrystal alloys with favorable tribological performance in view of microstructure and mechanical properties
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DOI：
10.1016/j.matdes.2020.108735
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发表时间：
2020-08
影响因子：
8.4
通讯作者：
Kyungju Lee;Yan Chen;W. Dai;D. Naugle;Hong Liang
中科院分区：
文献类型：
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作者：
Kyungju Lee;Yan Chen;W. Dai;D. Naugle;Hong Liang
准晶已被用于各种应用中，以改善耐磨性以及摩擦。合金中准晶（i相）的含量和显微组织对合金的力学性能和摩擦学性能有着决定性的影响。本研究开发了四种具有不同i相含量和晶粒尺寸的（β + i）双相准晶合金，以借助软β相来缓解i相的脆性。通过冲击试验、磨损试验和分析，研究了i相含量和晶粒尺寸的影响。通过退火处理，i相的数量增加了约38%（59.24% → 81.75%），同时i相的晶粒尺寸也从3.47 μm增加到9.98 μm。随着i相的量增加，硬度可以从712 HV增加到763 HV。同时，增加的晶粒尺寸（i相）降低了磨损试验中晶粒的接触应力;因此，比磨损率可以从2.21 × 10− 4 mm 3/Nm降低到0.5 × 10− 4 mm 3/Nm。不仅如此，还利用实验数据得到了一个实验磨损方程来预测双相合金的磨损行为。
Quasicrystals have been used in various applications to improve wear resistance as well as friction. It is known that quasicrystal (i-phase) content and microstructure in alloys have a decisive effect on the mechanical properties and tribological performance. In this research, four (β + i)-dual-phased quasicrystal alloys with different i-phase content and grain size were developed to alleviate the brittleness of the i-phase with the help of the soft β-phase. The influences of the i-phase content and grain size were investigated through impact test, wear test, and analysis. Through the annealing process, the amount of the i-phase was increased by about 38% (59.24% → 81.75%), and, besides, the grain size of the i-phase was simultaneously increased from 3.47 μm up to 9.98 μm. As the amount of i-phase increased, it was possible to increase the hardness from 712 HV to 763 HV. Meanwhile, the increased grain size (i-phase) reduced the contact stress of the grain during wear testing; thus, the specific wear rate could be decreased from 2.21 × 10−4mm3/Nm to 0.5 × 10−4mm3/Nm. Not only that, but an experimental wear equation was obtained using empirical data to predict the wear behavior of the dual-phased alloys.