Effect of strain rate on the tension–compression asymmetric responses of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si
Effect of strain rate on the tension–compression asymmetric responses of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si
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DOI：
10.1016/j.matdes.2014.05.004
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发表时间：
2014-09
影响因子：
8.4
通讯作者：
Q. Zhang;Jun Zhang;Yang Wang
中科院分区：
文献类型：
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作者：
Q. Zhang;Jun Zhang;Yang Wang
对Ti-6.6Al-3.3Mo-1.8Zr-0.29Si合金在不同应变率下的拉压不对称性进行了实验研究。采用分离式霍普金森杆技术获得了单轴拉伸和压缩加载条件下的动态应力应变响应。实验结果表明，该合金是一种速率敏感材料。拉伸屈服强度和压缩屈服强度均随应变速率的增加而增加。合金的力学响应具有拉压不对称性。压缩时的屈服强度和随后的流变应力远高于拉伸时的屈服强度和随后的流变应力。拉伸时屈服强度对应变率的变化比压缩时更敏感。拉压屈服强度之差随应变速率的增加而增大。拉伸试样以韧性断裂的方式断裂，呈现特征性韧窝，而压缩试样以局部剪切断裂的方式断裂。
An experimental investigation is performed to explore the tension–compression asymmetry of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy over a wide range of strain rates. A split Hopkinson bar technique is used to obtain the dynamic stress–strain responses under uniaxial tension and compression loading conditions. Experimental results indicate that the alloy is a rate sensitive material. Both tension yield strength and compression yield strength increase with increasing strain rate. The mechanical responses of the alloy have the tension–compression asymmetry. The values of yield strength and subsequent flow stress in compression are much higher than that in tension. The yield strength is more sensitive to change with strain rate in tension than compression. The difference of the yield strength between tension and compression increases with the increase of strain rate. The tensile specimen is broken in a manner of ductile fracture presenting characteristic dimples, while the compressive specimen fails in a manner of localized shearing failure.