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Processing Map of Powder Metallurgy Al-W Alloys at Elevated Temperatures

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Abstract

An Al-0.71 wt.% W alloy was prepared via powder metallurgy (PM) using a room-temperature pressing process and a subsequent hot-pressing process. Studies of the deformation behavior of the PM Al-W alloy were conducted using hot-compression tests in the temperature range from 420 to 570 °C and a strain rate range from 0.001 to 5 s−1. After the stress-strain data were acquired as a function of temperature and strain rate, processing maps that depict the variation in the power dissipation efficiency were constructed and interpreted via the dynamic materials model. The optimum temperature and strain rate combination for PM billet conditioning were demonstrated to be 560-570 °C and 0.001 s−1, respectively. Additionally, a secondary metal working process with a higher production efficiency on the PM billet was conducted at a higher strain rate from 0.01 to 0.1 s−1 and at a low temperature from 500 to 540 °C. The PM Al-W alloy was successfully extruded at 540 °C with a ram speed of 2 mm min−1 and an extrusion ratio of 5:1. The ultimate tensile strength and elongation of the test sample taken from the 15-mm-diameter as-extruded rods were 478 MPa and 15.4%, respectively.

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Authors and Affiliations

  1. School of Material Science and Engineering, North University of China, Taiyuan, 030051, China

    Yong Xue, Yue Du & Zhimin Zhang

  2. 14th Research Institute, China Academy of Launch Vehicle Technology, Beijing, 100076, China

    Youwang Huang

  3. School of Mechatronics Engineering, North University of China, Taiyuan, 030051, China

    Lafeng Guo

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  1. Yong Xue
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Correspondence to Yong Xue.

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Xue, Y., Du, Y., Zhang, Z. et al. Processing Map of Powder Metallurgy Al-W Alloys at Elevated Temperatures. J. of Materi Eng and Perform 26, 3216–3225 (2017). https://doi.org/10.1007/s11665-017-2750-3

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  • DOI: https://doi.org/10.1007/s11665-017-2750-3

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