Investigation of the effect of Al–5Ti–1B grain refiner on dry sliding wear behavior of an Al–Zn–Mg–Cu alloy formed by strain-induced melt activation process
Investigation of the effect of Al–5Ti–1B grain refiner on dry sliding wear behavior of an Al–Zn–Mg–Cu alloy formed by strain-induced melt activation process
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DOI：
10.1016/j.matdes.2012.10.058
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发表时间：
2013-04
影响因子：
8.4
通讯作者：
M. Alipour;Baharak Ghorbanian Aghdam;Hamid Ebrahimi Rahnoma;M. Emamy
中科院分区：
文献类型：
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作者：
M. Alipour;Baharak Ghorbanian Aghdam;Hamid Ebrahimi Rahnoma;M. Emamy
研究了Al-5 Ti-1B中间合金和改进的应变诱导熔体激活工艺对Al-12 Zn-3 Mg-2. 5Cu铝合金组织特征、力学性能和干滑动磨损性能的影响。含Ti中间合金的最佳加入量为2 wt.%。该合金采用改进的应变诱导熔体激活（SIMA）工艺制备。优化了获得细小球状组织的二次加热条件。应变诱导熔体激活过程的最佳温度和时间分别为575 ℃和20 min。拉伸试验前对所有试样进行T6热处理。晶粒细化剂的加入与T6热处理相结合，可显著提高合金的力学性能。经T6热处理后，经2 wt.%细化的试样的平均抗拉强度分别从283 MPa和252 MPa提高到587 MPa和564 MPa Al-5 Ti-1B合金在应变诱导熔体激活过程前后的组织结构。研究了该合金在常温下的干滑动磨损性能。结果表明，T6热处理显著提高了Al-12 Zn-3 Mg-2.5Cu铝合金的抗干滑动磨损性能。结果表明，球状组织试样的极限强度和干滑动磨损性能低于未经应变诱导熔体活化处理的Ti细化试样。
This study was undertaken to investigate the influence of Al–5Ti–1B master alloy and modified strain-induced melt activation process on the structural characteristics, mechanical properties and dry sliding wear behavior of Al–12Zn–3Mg–2.5Cu aluminum alloy. The optimum amount of Ti containing master alloy for proper grain refining was selected as 2wt.%. The alloy was produced by modified strain-induced melt activation (SIMA) process. Reheating condition to obtain a fine globular microstructure was optimized. The optimum temperature and time in strain-induced melt activation process are 575°C and 20min, respectively. T6 heat treatment was applied for all specimens before tensile testing. Significant improvements in mechanical properties were obtained with the addition of grain refiner combined with T6 heat treatment. After the T6 heat treatment, the average tensile strength increased from 283MPa to 587MPa and 252MPa to 564MPa for samples refined with 2wt.% Al–5Ti–1B before and after strain-induced melt activation process, respectively. Dry sliding wear performance of the alloy was examined in normal atmospheric conditions. The experimental results showed that the T6 heat treatment considerably improved the resistance of Al–12Zn–3Mg–2.5Cu aluminum alloy to the dry sliding wear. The results showed that ultimate strength and dry sliding wear performance of globular microstructure specimens was a lower value than that of Ti-refined specimens without strain-induced melt activation process.