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金属学报    DOI: 10.3724/SP.J.1037.2013.00410
  论文 本期目录 | 过刊浏览 |
Mo-Si-B三元系中T2相的脆-韧转变行为
潘昆明,张来启,王礞,林均品
北京科技大学新金属材料国家重点实验室, 北京 100083
BRITTLE-TO-DUCTILE TRANSITION FOR T2 IN THE Mo-Si-B SYSTEM
PAN Kunming, ZHANG Laiqi, WANG Meng, LIN Junpin
State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing, Beijing 100083
全文: PDF(3804 KB)  
摘要: 

采用压缩和单边缺口三点弯曲实验,研究了Mo5SiB2 (T2相)合金试样在真空条件和不同温度下的压缩行为和断裂行为,利用XRD, SEM-EDS和TEM等对试样变形后的微观组织、位错组态和断口形貌进行了分析和观察.结果表明, T2相的脆-韧转变温度为1000-1200℃.在外加切应力的作用下, [010](001)和<110>{110}等多个滑移系开始开动,导致试样发生明显的塑性变形. 由于刃型位错比螺型位错或混合型位错活跃,表现为[010]刃型位错深入到滑移面{110}, 与<110>位错发生交互作用,形成大量位错节点, 导致加工硬化. 随温度升高,试样断裂模式从单一解理断裂向穿晶解理-沿晶混合断裂转变,在1000℃时, 试样断口处能清晰地观察到滑移带.

关键词 Mo5SiB2 (T2相)压缩变形断裂位错组态脆-韧转变    
Abstract

The ordered intermetallic Mo5SiB2 (T2 phase) is a promising elevated-temperature structural material because of its high melting temperature, and excellent resistance to oxidation and creep. T2 phase has a body-centered tetragonal D81 structure (I4/mcm),with 20 Mo, 4 Si and 8 B atoms situating in layered arrangements along the c axis.This structure has been regarded as the obstacle to plastic deformation or dislocation activity especially at ambient temperature. However, like most intermetallic compounds, it undergoes a brittle-to-ductile transition (BDT) up to high temperatures, where the increased ductility is companied by microstructure changes. The feature of high-temperature applications makes it necessary to investigate the BDT behavior. The analysis of microstructure, dislocation configuration and fracture surfaces were carried out by compression and three-point bending tests, coupled with XRD, SEM-EDS and TEM methods. The result suggested that BDT happened over a wide temperature range of 1000-1200℃. At the BDT temperature above, multiple slip systems such as the [010](001) and <110>{110} could be activated under an applied stress, resulting in obvious plastic deformation. Since the edge dislocation displayed more activity than screw and mixed ones, the edge dislocation with b=[010] interacted with the <110>-type dislocation via slipping into its plane of {110}. Therefore, the work hardening was caused by the formation of lots of dislocation nodal points during the subsequent compression process. With temperature increasing, the fracture mode underwent a conversion from transgranular cleavage at ambient temperature to a mix of transgranular cleavage and intergranular failure.

Key wordsMo5SiB2 (T2 phase)    compressive deformation    fracture    dislocation configuration    brittle-to-ductile transition
收稿日期: 2013-07-15     
基金资助:

国家自然科学基金项目50871012和国家重点基础研究发展计划项目2011CB605502资助

通讯作者: 张来启     E-mail: zhanglq@ustb.edu.cn
作者简介: 潘昆明, 男, 1985年生, 博士生

引用本文:

潘昆明,张来启,王礞,林均品. Mo-Si-B三元系中T2相的脆-韧转变行为[J]. 金属学报, 10.3724/SP.J.1037.2013.00410.
PAN Kunming, ZHANG Laiqi, WANG Meng, LIN Junpin. BRITTLE-TO-DUCTILE TRANSITION FOR T2 IN THE Mo-Si-B SYSTEM. Acta Metall Sin, 2013, 49(11): 1392-1398.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00410      或      https://www.ams.org.cn/CN/Y2013/V49/I11/1392

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