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OALib Journal期刊
ISSN: 2333-9721
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Mo－Si－B三元系中T2相的脆－韧转变行为
DOI: 10.3724/SP.J.1037.2013.00410, PP. 1392-1398
Keywords: Mo5SiB2,(T2相),压缩变形,断裂,位错组态,脆－韧转变
Abstract:
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}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.
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