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Hf-基非晶合金的力学性能研究

DOI: 10.11858/gywlxb.2012.03.014, PP. 333-337

Keywords: Hf-基非晶合金,应变速率,断口形貌,绝热升温

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Abstract:

利用MTS810实验机和分离式霍普金森压杆(SHPB),对Hf44.5Cu27Ni13.5Ti5Al10块体非晶合金进行了准静态和动态压缩实验,应变速率范围为10-4~103s-1,给出了不同应变速率下非晶合金的应力-应变曲线,并对其压缩断口形貌进行了扫描电镜观察。结果表明:在准静态压缩条件下,Hf44.5Cu27Ni13.5Ti5Al10非晶合金不具有应变速率敏感性,在由放射区和扇形区组成的断口形貌上观察到纳米级韧窝和60nm左右的周期性条纹结构;在动态压缩条件下,随着应变速率的增加,动态屈服强度明显减小,合金具有应变速率敏感性,同时断裂表面为夹杂着脉络条纹的絮状结构。进一步观察发现,动态压缩断口上存在3种特征断裂形貌:树枝状条纹、典型脉络花纹和合金熔体。

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