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石晓辉,曹祖涵,张敏,郭瑞鹏,乔珺威,吴玉程.钛合金六方马氏体α′的特殊金相腐蚀行为及机理[J].稀有金属材料与工程(英文),2020,49(6):1989~1994.[Xiaohui Shi,Cao Zuhan,Zhang Min,Guo Ruipeng,Qiao Junwei and Wu Yucheng.A special metallographical corrosion behavior and its mechanism of hexagonal martensite α′ for titanium alloys[J].Rare Metal Materials and Engineering,2020,49(6):1989~1994.]
A special metallographical corrosion behavior and its mechanism of hexagonal martensite α′ for titanium alloys
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Received:April 27, 2019  Revised:May 25, 2019
DOI:
Key words: Hexagonal martensite α′  corrosion behavior  orthogonal  mechanism  titanium alloy
Foundation item:国家自然科学基金资助(项目号51801132)
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Xiaohui Shi,Cao Zuhan,Zhang Min,Guo Ruipeng,Qiao Junwei and Wu Yucheng  
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Abstract:
      Hexagonal martensite α′ gets special metallographical corrosion behavior: the inner microstructure of some grains shows unobvious contrast after corrosion, however, some other grains have obvious corrosion character, namely the inner vimineous α′ array orthogonally. In present work, the mechanism of this corrosion behavior was studied based on OM, AFM and EBSD analyses. It’s found that: there are three groups of orthogonal precipitation directions of α′ when transformed from original β phase, if the metallographical observation surface is parallel or near-parallel to any one of the three groups of orthogonal precipitation directions, then this group of α′ plates must array orthogonally or parallelly. Under this circumstance, α′ plates are perpendicular to the observation surface, thus the α′/α′ interfaces are deep, which leads to deep corrosion depth, and finally deep corrosion characters are shown. For a given grain, the two arrangement modes of α′ plates can exist simultaneously, which appears orthogonal array mode as a whole.