Microstructure and mechanical properties of bulk nanocrystalline Al-Fe alloy processed by mechanical alloying and spark plasma sintering

作者：Sasaki T T; Ohkubo T; Hono K^*

来源：Acta Materialia, 2009, 57(12): 3529-3538.

DOI：10.1016/j.actamat.2009.04.012

• Mechanical alloying
• Plasma spark sintering
• Aluminum alloy
• Nanocrystalline alloy

Nanocrystalline Al-5 at.% Fe alloy powders produced by mechanical alloying were consolidated by spark plasma sintering. The sintered sample showed high strength >1000 MPa with a large plastic strain of 15% at room temperature and 500 MPa at 350 degrees C. Microstructure characterizations by transmission electron microscopy and atom probe tomography revealed that the sintered samples are composed of alpha-Al and Al(6)Fe nanocrystalline regions with 90 nm in diameter and a minor fraction of Al(13)Fe(4) phase and coarsened 0.5-1 mu m of alpha-Al grains. This bimodally grained feature is attributed to the relatively large plastic strain for the strength level of 1000 MPa at room temperature.

• 出版日期2009-7