北理工王富耻等合作团队:开发出了超高强高熵合金
作者:Yao-Jian Liang, Linjing Wang, Yuren Wen, Baoyuan Cheng, Qinli Wu, Tangqing Cao, Qian Xiao, Yunfei Xue, Gang Sha, Yandong Wang, Yang Ren, Xiaoyan Li, Lu Wang, Fuchi Wang, Hongnian Cai
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2018-11-07 23:51:24
为了进一步提升高熵合金的强度,同时还保有足够的韧性及高熵合金独特的优势,北京理工大学材料学院王富耻、王鲁教授团队,薛云飞课题组经过长期攻关,创新合金设计理念,成功在高熵合金中引入大量纳米强化相并获得一种独特的纳米调幅结构。该结构可通过多重机制,提供有效强化,贡献超过560%的强度增加。这一新型超高强高熵合金不仅具有超高的强度(1.9GPa,接近传统钛合金的两倍)和良好塑性,还具有比传统钢铁材料密度低、耐蚀性好等优势,能满足先进武器装备对材料性能的苛刻需求,展现出切实的应用潜力。这一原创性成果在极大提升高熵合金强度的同时,仍能保持良好的塑性和加工硬化能力,不但大幅度提高高熵合金的综合性能,进一步拓展了可能的工程应用领域,其创新设计理念还能为高熵合金的设计提供更多的可能性,为开发兼具超高强度和塑性的高熵合金开辟新的途径。
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High-content ductile coherent nanoprecipitates achieve ultrastrong high-entropy alloys
作者:Yao-Jian Liang, Linjing Wang, Yuren Wen, Baoyuan Cheng, Qinli Wu, Tangqing Cao, Qian Xiao, Yunfei Xue, Gang Sha, Yandong Wang, Yang Ren, Xiaoyan Li, Lu Wang, Fuchi Wang, Hongnian Cai
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2018-11-07 23:51:24
导语
Precipitation-hardening high-entropy alloys (PH-HEAs) with good strength−ductility balances are a promising candidate for advanced structural applications. However, current HEAs emphasize near-equiatomic initial compositions, which limit the increase of intermetallic precipitates that are closely related to the alloy strength. Here we present a strategy to design ultrastrong HEAs with high-content nanoprecipitates by phase separation, which can generate a near-equiatomic matrix in situ while forming strengthening phases, producing a PH-HEA regardless of the initial atomic ratio. Accordingly, we develop a non-equiatomic alloy that utilizes spinodal decomposition to create a low-misfit coherent nanostructure combining a near-equiatomic disordered face-centered-cubic (FCC) matrix with high-content ductile Ni3Al-type ordered nanoprecipitates. We find that this spinodal order–disorder nanostructure contributes to a strength increase of ~1.5 GPa (>560%) relative to the HEA without precipitation, achieving one of the highest tensile strength (1.9 GPa) among all bulk HEAs reported previously while retaining good ductility (>9%).
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