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首页> 外文期刊>Journal of Materials Research >Improvement in elevated-temperature properties of Al-13% Si piston alloys by dispersoid strengthening via Mn addition
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Improvement in elevated-temperature properties of Al-13% Si piston alloys by dispersoid strengthening via Mn addition

机译：通过添加锰进行弥散强化来改善Al-13％Si活塞合金的高温性能

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摘要

Eutectic Al-13% Si alloys are widely used in automotive components, such as pistons and cylinder heads. Recently, the demand on the performance of piston alloys at high temperature is greatly increased to enhance the engine efficiency and to reduce exhaust emission. In the present work, Mn was added to strengthen the aluminum matrix via the formation of thermally stable dispersoids. The evolution of dispersoids during heat treatment and their influence on elevated-temperature properties were studied. The results showed that the as-cast microstructures in the experimental alloys without/with Mn addition were similar, which were composed of eutectic Si, primary Mg2Si, Al-Fe-Ni, Al-Cu-Ni, and pi-Al-Mg-Fe-Si intermetallic phases. In the alloy with Mn addition, a number of alpha-Al(Mn,Fe)Si dispersoids started to form after a heat treatment at 425 degrees C for 24 h and reached the peak condition at 500 degrees C for 6 h, resulting in a remarkable increase of the microhardness at room temperature and the improvement in the yield strength and creep resistance at 300 degrees C. As a complementary strengthening mechanism, the dispersoid strengthening in the aluminum matrix provides a novel approach to improve the elevated-temperature properties of Al-Si piston alloys.
机译：共晶Al-13％Si合金广泛用于汽车零部件，例如活塞和汽缸盖。近来，对活塞合金在高温下的性能的需求大大增加，以提高发动机效率并减少废气排放。在目前的工作中，通过形成热稳定的分散质，添加了Mn以增强铝基体。研究了分散体在热处理过程中的演变及其对高温性能的影响。结果表明，添加/不添加Mn的实验合金的铸态组织相似，由共晶Si，初生Mg2Si，Al-Fe-Ni，Al-Cu-Ni和pi-Al-Mg-组成。 Fe-Si金属间相。在添加了Mn的合金中，在425℃下热处理24小时后，开始形成大量的α-Al（Mn，Fe）Si弥散体，并在500℃下达到了峰值状态6 h，结果是室温下显微硬度的显着提高以及300摄氏度时屈服强度和抗蠕变性的提高。作为一种补充的强化机制，铝基体中的弥散强化对改善Al-的高温性能提供了一种新颖的方法。硅活塞合金。

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  • 来源
    《Journal of Materials Research》 |2018年第20期|3430-3438|共9页
  • 作者

    Liu Kun; Chen X-Grant;

  • 作者单位

    Univ Quebec Chicoutimi, Dept Appl Sci, Saguenay, PQ G7H 2B1, Canada;

    Univ Quebec Chicoutimi, Dept Appl Sci, Saguenay, PQ G7H 2B1, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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