钴及钴基合金拉伸和压缩变形机理的研究现状

doi:10.11896/cldb.19050142

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Abstract Cobalt-based superalloys are superior to nickel-based superalloys in terms of their high temperature thermal corrosion resistance, thermal fatigue resistance and weldability. Their working temperatures are higher, which is widely concerned by researchers. However, its high tempe-rature strength is lower than that of nickel-based superalloys, which limits its application range. Compared with traditional cobalt-based superalloys, the new cobalt-based superalloys are favored by people because of their γ/γ′ coherent strengthening structure similar to the nickel-based superalloys. It is expected to replace nickel-based superalloys and become a new alloy system, but further improvement of the tensile and compressive properties of the new cobalt-based superalloys is a problem that must be solved in expanding the application of alloys.
The studies on the tensile and compressive properties of pure cobalt have been reported in detail. The recent years, researchers have been constantly researching how to improve the γ′ phase stability of new cobalt-based superalloys, as well as the tensile and compressive properties of the alloy. At present, the elongation of the new cobalt-based superalloys has reached about 18%.
The abnormal yield phenomena of a new cobalt-based superalloy is caused by the cross-slip of screw dislocations pinned in the compression deformation. Its driving force is derived from the elastic anisotropy energy and the lower anti-phase boundary energy (APB) on {100} plane. Near the peak value of abnormal stress, dislocations are confined to the γ matrix, and occasionally the dislocations cut through the γ′ phase are observed. And abnormal yield phenomena is also found under tensile loading at high temperature. In addition, based on ternary Co-Al-W alloy, the elongation of the new Co-based superalloy can be gradually improved by adding micro-alloying elements, such as Mo, Mg, Ce, etc.
This paper summarizes the research status of the tensile and compressive deformation mechanism of cobalt and cobalt-based alloys. By introducing the slip deformation, twinning deformation, deformation mechanism and the characteristics of different deformation twins of close-packed hexagonal (HCP) cobalt metal. The plastic deformation mechanism of cobalt-based superalloys is taken as the main line, and the compression and tensile deformation of cobalt-based superalloys are emphasized, especially the anomalous flow stress of cobalt-based superalloys streng-thened by γ/γ′ conformity, and the plastic deformation and failure modes of alloys under room temperature and high temperature tensile conditions are described. Finally, the problems to be solved are put forward in the plastic deformation of the new cobalt-based superalloy.

Key words： dislocation slip twin Co-Al-W based superalloy abnormal yield phenomena in-situ tension

Published: 05 November 2020

CLC number:

TG146.1+6

Fund:This work was financially supported by the National Natural Science Foundation of China (51561019).

About author:: Yangtao Xu, a member of the Communist Party of China, doctor of engineering, professor. In 2015, he was engaged in postdoctoral research at Lanzhou University of Technology/Fangda Carbon New Material Science and Technology Co., Ltd. He is currently the president of Baiyin New Materials Research Institute. He is also a reviewer of Solar Energy Materials & Solar Cells and Rare Metals. His research interests are preparation and properties of cobalt-based alloys, electrocrystallization of non-ferrous metals and carbon materials for solar thermal storage.

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Cite this article:

XU Yangtao,WANG Yonghong,MA Hongli. Research Status of Tensile and Compression Deformation Mechanism of
Cobalt and Cobalt Based Alloys[J]. Materials Reports, 2020, 34(19): 19117-19121.

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http://www.mater-rep.com/EN/10.11896/cldb.19050142 OR http://www.mater-rep.com/EN/Y2020/V34/I19/19117

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