0.2合金,發(fā)現(xiàn)鑄態(tài)時(shí)的合金形成了B2相和BCC相,且室溫壓縮性能良好,壓縮塑性為32.6%,屈服強(qiáng)度為1530.4 MPa,抗壓強(qiáng)度為4035.0 MPa,硬度接近600 HV。在550℃、800℃和1050℃對(duì)其進(jìn)行熱處理,采用水冷的方式以保存高溫相,三個(gè)溫度對(duì)應(yīng)的相組成分別為BCC+B2、BCC+B2+FCC+σ和BCC+B2+FCC,熱處理后合金脆性和硬度升高。采用磁懸浮熔煉制備了大塊AlCoCrFeNiTi0.2合金,該合金成分分布比較均勻,形成了BCC+B2+σ三相,在600℃時(shí)壓縮塑性為35.0%,且仍能保持1486.7 MPa的屈服強(qiáng)度,耐高溫性能較好。"/>

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熱處理和熔煉方式改變對(duì)AlCoCrFeNiTi0.2高熵合金的影響
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北京科技大學(xué)

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Effect of heat treatment and melting method changing on AlCoCrFeNiTi0.2 high entropy alloy
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University of Science and Technology Beijing

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    摘要:

    采用電弧熔煉方法設(shè)計(jì)制備了AlCoCrFeNiTi0.2合金,發(fā)現(xiàn)鑄態(tài)時(shí)的合金形成了B2相和BCC相,且室溫壓縮性能良好,壓縮塑性為32.6%,屈服強(qiáng)度為1530.4 MPa,抗壓強(qiáng)度為4035.0 MPa,硬度接近600 HV。在550℃、800℃和1050℃對(duì)其進(jìn)行熱處理,采用水冷的方式以保存高溫相,三個(gè)溫度對(duì)應(yīng)的相組成分別為BCC+B2、BCC+B2+FCC+σ和BCC+B2+FCC,熱處理后合金脆性和硬度升高。采用磁懸浮熔煉制備了大塊AlCoCrFeNiTi0.2合金,該合金成分分布比較均勻,形成了BCC+B2+σ三相,在600℃時(shí)壓縮塑性為35.0%,且仍能保持1486.7 MPa的屈服強(qiáng)度,耐高溫性能較好。

    Abstract:

    The AlCoCrFeNiTi0.2 alloy was designed and prepared by the arc melting method. It was found that the as-cast alloy formed the B2 phase and the BCC phase, and showed good room temperature compressibility, compressive plasticity of 32.6%, yield strength of 1530.4 MPa, and compressive strength of 4035.0 MPa. The hardness is about 600 HV. It was heat-treated at 550°C, 800°C and 1050°C, and the high-temperature phase was preserved by water cooling. The phase composition corresponding to the three temperatures was BCC + B2, BCC + B2 + FCC + σ, and BCC + B2 + FCC. The brittleness and hardness of the alloy increase after heat treatment. A bulk AlCoCrFeNiTi0.2 alloy was prepared by magnetic levitation melting. The alloy has a relatively uniform composition distribution, forming a BCC + B2 + σ three-phase structure. The compressive plasticity is 35.0% at 600°C, and it can still maintain a yield strength of 1486.7 MPa which is good at high temperature.

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張璐,張勇.熱處理和熔煉方式改變對(duì)AlCoCrFeNiTi0.2高熵合金的影響[J].稀有金屬材料與工程,2021,50(1):263~270.[Zhang Lu, Zhang Yong. Effect of heat treatment and melting method changing on AlCoCrFeNiTi0.2 high entropy alloy[J]. Rare Metal Materials and Engineering,2021,50(1):263~270.]
DOI：10.12442/j. issn.1002-185X.20200012

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  • 收稿日期:2020-01-06
  • 最后修改日期:2020-04-19
  • 錄用日期:2020-04-26
  • 在線發(fā)布日期: 2021-02-05
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