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OALib Journal期刊
ISSN: 2333-9721
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内生枝晶相体积分数可控的钛基非晶复合材料
DOI: 10.3724/SP.J.1037.2012.00198, PP. 861-866
Keywords: 钛基非晶合金,树枝晶,内生复合材料,力学性能
Abstract:
采用直接调控增塑相摩尔分数的方法成功制备了系列含有bcc枝晶相的(Ti32.8Zr30.2Ni5.3Cu9Be22.7)100-x(Ti61.5Zr36.4Cu2.1)x(x=10-95)非晶复合材料.采用XRD,SEM和DSC等方法研究了不同$x$值下枝晶相的体积分数以及形貌的变化规律,并利用TEM研究了内生枝晶相的结构和两相界面结构.结果表明,在Ti32.8Zr30.2Ni5.3Cu9Be22.7合金中直接添加不同量的Ti61.5Zr36.4Cu2.1合金能够有效地控制内生枝晶相的析出量,获得界面结合良好的非晶复合材料,且枝晶相的尺寸及体积分数与$x$值成正比.室温压缩实验结果表明,当x>30时,复合材料的塑性变形能力可得到明显改善.x值越大,枝晶相体积分数越高,复合材料屈服强度越低,塑性改善效果越明显.不同体积分数的复合材料均表现出明显的加工硬化现象.当x=90时,复合材料的塑性变形量达到14.4%,断裂极限强度达1917MPa.
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