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Al-Cr based alloys produced by powder metallurgy represent materials with excellent thermal stability

机译：通过粉末冶金生产的Al-Cr基合金代表具有出色热稳定性的材料

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摘要

The presented work describes properties of AlCr6Fe2Ti alloy which is a representative of highly thermally stable Al-based alloys. The investigated material was prepared by powder metallurgy (PM). Its structure was composed of very fine recrystallized α(Al) grains and Al_(13)(Cr,Fe)_2 spheroids. Hardness and strength of the PM alloy was slightly higher than that of the T6 heat treated AlSi-12CuMgNi casting alloy. The plasticity was significantly higher and similar to the wrought 7075 alloy. The thermal stability was evaluated by measuring room-temperature mechanical properties after a long-term annealing at 400℃. The PM alloy showed much higher thermal stability than both AlSi-12CuMgNi and 7075 alloy, since its room temperature hardness and tensile properties did not reduce significantly even after annealing at 400℃/200 hours. In contrast, the hardness and strength of the commercial alloys reduced rapidly due to annealing. Different strengthening mechanisms operating in the investigated alloys are described.
机译：提出的工作描述了AlCr6Fe2Ti合金的性能，该合金是高度热稳定的Al基合金的代表。所研究的材料是通过粉末冶金（PM）制备的。它的结构由非常细的重结晶α（Al）晶粒和Al_（13）（Cr，Fe）_2球体组成。 PM合金的硬度和强度略高于T6热处理的AlSi-12CuMgNi铸造合金。可塑性明显高于变形的7075合金。通过在400℃下长期退火后测量室温机械性能来评价热稳定性。 PM合金具有比AlSi-12CuMgNi和7075合金更高的热稳定性，因为即使在400℃/ 200小时退火后，其室温硬度和拉伸性能也不会显着降低。相反，由于退火，商品合金的硬度和强度迅速降低。描述了在研究的合金中不同的强化机理。

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  • 来源
    《Aluminium》 |2007年第4期|p.83-86|共4页
  • 作者

    D. Vojtech;

  • 作者单位

    Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 轻金属冶炼;
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