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Age Hardening of AlCrMoNiTi High Entropy Alloy Prepared by Powder Metallurgy
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Age Hardening of AlCrMoNiTi High Entropy Alloy Prepared by Powder Metallurgy
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Post-doctoral Scientific Research Foundation of China (2013M541986); Doctoral Scientific Foundation of Henan Institute of Engineering (062101); Post-doctoral Scientific Research Foundation of Zhengzhou University

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    摘要:

    采用粉末冶金工藝制備了AlCrMoNiTi高熵合金，并對(duì)其鑄態(tài)和退火態(tài)的微觀組織和硬度進(jìn)行了研究。結(jié)果表明，鑄態(tài)合金由富（Cr, Mo）bcc固溶體枝晶相和富(Al，Ni，Ti) fcc固溶體枝晶間相組成。時(shí)效合金在900 ℃高溫可獲得最高硬度HV約為6150 MPa,在1000 ℃發(fā)生退火軟化現(xiàn)象，但是其硬度HV仍保持在5160 MPa的高硬度水平。這表明，AlCrMoNiTi高熵合金具有優(yōu)異的高溫時(shí)效硬化特性。該合金在800 ℃時(shí)的時(shí)效硬化特性主要?dú)w因于細(xì)晶強(qiáng)化，在900 ℃時(shí)則歸因于第二相（bcc2）的析出硬化。在1000 ℃時(shí)發(fā)生退火軟化現(xiàn)象，其原因在于第二相的分解和晶粒粗化。

    Abstract:

    The AlCrMoNiTi high entropy alloy was prepared by powder metallurgy process. Its microstructure and hardness of as-cast and annealed state were studied. The results show that the as-cast alloy exhibits a mixture of the dendrite (Cr, Mo)-rich bcc phase and the interdendrite (Al, Ni, Ti)-rich fcc phase. The aged alloy can obtain a peak hardness HV of 6150 MPa at 900 oC, and then anneal softening occurs at 1000 oC, but its hardness HV still maintained at a high level of 5160 MPa. This shows that the AlCrMoNiTi alloy exhibits a good high-temperature age hardening performance. Age hardening of the alloy is mainly attributed to the grain refinement strengthening at 800 oC and the precipitation hardening of the second phase (bcc2) at 900 oC. The disappeared second phase and grain coarsening are the main reasons for the softening anneal at 1000 oC.

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任 波,馬建輝,趙瑞鋒,關(guān)紹康,張紅松. Age Hardening of AlCrMoNiTi High Entropy Alloy Prepared by Powder Metallurgy[J].稀有金屬材料與工程,2014,43(6):1286~1290.[Ren Bo, Ma Jianhui, Zhao Ruifeng, Guan Shaokang, Zhang Hongsong. Age Hardening of AlCrMoNiTi High Entropy Alloy Prepared by Powder Metallurgy[J]. Rare Metal Materials and Engineering,2014,43(6):1286~1290.]
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  • 收稿日期:2014-01-02
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  • 在線發(fā)布日期: 2014-11-13
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