Corrosion and Mechanical Properties of Al-5 At. Pct Cr Produced by Cryomilling and Subsequent Consolidation at Various Temperatures
Corrosion and Mechanical Properties of Al-5 At. Pct Cr Produced by Cryomilling and Subsequent Consolidation at Various Temperatures
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通过低温研磨和随后在不同温度下固结生产的 Al-5 At. Pct Cr 的腐蚀和机械性能
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
R. Gupta
中科院分区：
文献类型：
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作者：
J. Esquivel;K. Darling;H. Murdoch;R. Gupta
在液氮温度下进行高能球磨，然后在200 °C、300 °C和450 °C下进行等通道轴向挤压，制备Al-5at.pct Cr合金。与相同成分的铸造合金的显微组织和腐蚀响应进行了比较。与相图所预期的金属间化合物和铸造合金中所见的不同，固结HEBM合金在铝基体中除了精细分散的富Cr相之外还表现出Cr的延长的固溶度。这导致改善的腐蚀行为，通过动电位极化和恒定浸泡试验在NaCl溶液中的调查。进行硬度和拉伸试验以评价机械性能。最高固结温度（450 °C）有助于显著的晶粒生长和Cr扩散，减少了用HEBM加工的有益效果。
An Al-5 at. pct Cr alloy was produced by high-energy ball milling at liquid nitrogen temperature followed by consolidation using equal-channel axial extrusion at 200 °C, 300 °C and 450 °C. The microstructure and corrosion response were compared with a cast alloy of the same composition. Rather than the intermetallics expected by the phase diagram and seen in the cast alloy, consolidated HEBM alloys exhibited extended solid solubility of Cr in the aluminum matrix in addition to a finely dispersed Cr-rich phase. This led to improvement in the corrosion behavior as investigated via potentiodynamic polarization and constant immersion tests in NaCl solution. Hardness and tensile tests were performed to evaluate the mechanical properties. The highest consolidation temperature (450 °C) contributed to significant grain growth and Cr diffusion, lessening the beneficial effects of processing with HEBM.