体心立方BCC基多元合金中的共格析出及强化

doi:10.11896/cldb.19030130

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Abstract The type, morphology (size and shape), and distribution of the second-phase particles precipitated on the solid solution matrix are dominant on the improvement of mechanical strengths of alloys. In particular, the coherent precipitation of particles is more beneficial to enhance the high-temperature mechanical properties of alloys. For example, it is the coherent precipitation of cubic L1₂-Ni₃Al ordered phase in FCC solid solution matrix that renders Ni-based superalloys with excellent high-temperature mechanical properties. Recently, the body-centered-cubic (BCC)-based multi-component alloys containing coherent precipitates have attracted extensive attention due to their prominent mechanical properties (especially high strength at elevated temperatures) induced by precipitation strengthening.
However, the non-coherent or half-coherent precipitated phases were often used to strengthen the matrix in conventional BCC-based enginee-ring alloys, which induces the coarsening of the second-phase precipitates during the aging period and embrittles alloys. Such alloys are generally sensitive to the post-processing. Recently, the ordered phase B2(L2₁) precipitation into disordered BCC matrix could be achieved in multi-principal alloy systems, which has great potential to improve the strength and toughness of alloys. The existing results show that BCC/B2 coherent microstructure exhibits a weave-like spinodal decomposition and it is difficult to precipitated the spherical or cuboidal B2/L2₁ nanoparticles, which also leads to a serious brittleness. Therefore, how to obtain cubic or spherical coherent particles in BCC-based multi-component alloys is a research hotspot.
It has been demonstrated that the lattice mismatch between the matrix and ordered phases is the most critical factor to determine the shape and size of precipitates. Therefore, the compositions of the BCC matrix and the ordered phase can be regulated by adjusting the species and amounts of alloying elements in alloys for the achievement of an optimum lattice mismatch matching the desired coherent microstructure. For example, in BCC-based special steels and high-entropy alloys, the spherical or cuboidal B2 nanoparticles were coherently precipitated into the BCC matrix through adjusting the lattice mismatch between BCC and B2 phases, by which a series of BCC-based special steels and high-entropy alloys with excellent properties could be obtained.
The present work summarizes comprehensively the phase structures and morphologies of coherent precipitates in several typical BCC-based alloys, such as special steels and high-entropy alloys. The mechanical properties of these alloys are also generalized. Then, the relationship between the lattice misfit and the particle morphology, and the mechanism of precipitation strengthening are illuminated. Finally, the development and application of coherently precipitation-strengthened BCC-based alloys are prospected.

Key words： BCC-based multi-component alloys coherent precipitation microstructure mechanical properties

Published: 10 April 2020

CLC number:

TG139

Fund:This work was financially supported by the Key Joint Projects of the National Natural Science Foundation of China (U1867201)

About author:: Sishu Xin, senior engineer of Kunming Institute of Physics, major in condensed matter physics, material physics, mainly engaged in III-V material preparation, device development and research on a small amount of structural materials. The materials involved are mainly indium antimonide, gallium arsenide and high perfor-mance titanium/zirconium alloy materials.
Qing Wangreceived her B.S.degree in welding from Shandong University of Technology in 1999, received her M.S. degree in material processing engineering from Gansu University of Technology in 2002 and received her Ph.D. degree in matreials science and engineering in Dalian University of Technology in 2005. She is mainly engaged in composition design, microstructure characterization and analysis, and research and development of advanced engineering alloy mate-rials, including high-performance titanium-based alloys, copper-based alloys, superalloys, zirconium-based alloys for nuclear power reactor cladding materials, special stainless steel, high-entropy alloy and so on.

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Cite this article:

XIN Sishu,WANG Zhenhua,LI Chunling, et al. Coherent Precipitation and Strengthening in Body-Centered-Cubic-based Multi-component Alloys[J]. Materials Reports, 2020, 34(7): 7130-7137.

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http://www.mater-rep.com/EN/10.11896/cldb.19030130 OR http://www.mater-rep.com/EN/Y2020/V34/I7/7130

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