Research Status of Tensile and Compression Deformation Mechanism of Cobalt and Cobalt Based Alloys
XU Yangtao1,2, WANG Yonghong1,2, MA Hongli1,2
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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.
作者简介: 徐仰涛,中共党员,工学博士,教授。2015年在兰州理工大学/方大炭素新材料科技股份有限公司联合站从事博士后科研工作。现任白银新材料研究院院长。兼任Solar Energy Materials & Solar Cells和《稀有金属》审稿人,甘肃省循环经济专家委员会委员。主要从事钴基合金制备及性能、有色金属电结晶及太阳能储热炭素材料的研究工作。主持完成国家自然科学基金和甘肃省重大科技专项项目等国家、省级科技专项项目、企业横向课题10余项;主持并完成国家重点实验室开放基金2项。在Solar Energy Materials & Solar Cells、Surface & Coatings Technology、China Welding、《稀有金属材料与工程》和《中国有色金属学报》等国内外著名期刊上发表论文40余篇,其中SCI/EI检索论文近30余篇。研究成果获得(第一获奖人)厅级科技进步二等奖、三等奖各1项,以主要参加人身份获得甘肃省技术发明二等奖和地厅级一等奖各1项;指导学生获得国家和省级奖励3项;获得省部级、地厅级人才扶持项目4项。
引用本文:
徐仰涛, 王永红, 马宏利. 钴及钴基合金拉伸和压缩变形机理的研究现状[J]. 材料导报, 2020, 34(19): 19117-19121.
XU Yangtao, WANG Yonghong, MA Hongli. Research Status of Tensile and Compression Deformation Mechanism of Cobalt and Cobalt Based Alloys. Materials Reports, 2020, 34(19): 19117-19121.
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2020, Vol. 34 
