CAJ | 학술논문

采用X射线衍射(XRD)和透射电子显微镜(TEM),研究TC21钛合金马氏体中亚结构的形貌和形成机理.结果显示,在960～1000°C温度范围内,TC21合金进行固溶淬火处理后会发生β→α″马氏体相变.在板条状α″马氏体内部发现有反相畴界状结构,并且该结构平行于α″马氏体的(001)和(020)面.该结构被确定为马氏体相变过程中诱导产生的一种堆垛层错,它具有反相畴界的形貌特征,但并不是有序/无序相变过程中产生的反相畴界.在马氏体相变过程中,马氏体畴形核并且长大,畴与畴之间相互碰撞,最终导致反相畴界状结构的产生.
채용X사선연사(XRD)화투사전자현미경(TEM),연구TC21태합금마씨체중아결구적형모화형성궤리.결과현시,재960～1000°C온도범위내,TC21합금진행고용쉬화처리후회발생β→α″마씨체상변.재판조상α″마씨체내부발현유반상주계상결구,병차해결구평행우α″마씨체적(001)화(020)면.해결구피학정위마씨체상변과정중유도산생적일충퇴타층착,타구유반상주계적형모특정,단병불시유서/무서상변과정중산생적반상주계.재마씨체상변과정중,마씨체주형핵병차장대,주여주지간상호팽당,최종도치반상주계상결구적산생.
The morphology and formation mechanism of the substructure of martensite in TC21 alloy was investigated by XRD and TEM.The results showed that the martensitic transformation from β to α" occurs upon quenching aftcr solution treatment between 960-1000 ℃.The antiphase boundary (APB)-like structure was observed clearly in the α" martensite plates.The APB-like contrasts exist along the (001) and (020) planes ofα" martensite.This APB-like structure ofα" martensite was identified as a kind of stacking fault with an APB-like morphology induced by martensitic transformation and not by order/disorder transition.During martensitic transformation,martensitic domains nucleate and grow,eventually encounter each other,resulting in the formation of the APB-like contrast.