Investigation on Mechanical Properties and Failure Mechanism of Ti-22Al-15Nb Alloy AITranslate
Abstract AITranslate
The microstructure and mechanical properties of Ti-Al based alloy with nominal composition of Ti-22Al-15Nb were investigated,and the deformation behavior under quasi-static and dynamic loading con- ditions was also discussed. The results show that as-cast Ti-22Al-15Nb alloy has equiaxed microstructure mainly composed of α2-Ti3 Al phase and B2-Ti2 AlNb phase, and lamellar α2 phase with random orientation is distributed uniformly in B2 matrix. Investigation on mechanical properties shows that the alloy exhibits higher yield strength of 1 100 MPa and higher compressive strength of 1 750 MPa,and better ductility dur- ing dynamic compression rather than quasi-static compression. Failure mechanism analysis shows that shear failure occurs in the alloy during quasi-static compression,and micro-cracks initiate in α2 phase or the boundary between az phase and B2 matrix and extend along the direction of the maximum shear stress to form main cracks, finally leading to alloy failure. Failure mode of the alloy during dynamic compression is adiabatic shear failure,adiabatic shear bands form at an angle of about 45° with the loading direction,and cracks initiate in the shear band and propagate with the increased strain, finally leading to alloy failure.
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Basic Information:
DOI：
Chinese Library Classification Number:TG146.1[金属学及工艺—金属材料]
Citation Information:
The microstructure and mechanical properties of Ti-Al based alloy with nominal composition of Ti-22Al-15Nb were investigated,and the deformation behavior under quasi-static and dynamic loading con- ditions was also discussed. The results show that as-cast Ti-22Al-15Nb alloy has equiaxed microstructure mainly composed of α2-Ti3 Al phase and B2-Ti2 AlNb phase, and lamellar α2 phase with random orientation is distributed uniformly in B2 matrix. Investigation on mechanical properties shows that the alloy exhibits higher yield strength of 1 100 MPa and higher compressive strength of 1 750 MPa,and better ductility dur- ing dynamic compression rather than quasi-static compression. Failure mechanism analysis shows that shear failure occurs in the alloy during quasi-static compression,and micro-cracks initiate in α2 phase or the boundary between az phase and B2 matrix and extend along the direction of the maximum shear stress to form main cracks, finally leading to alloy failure. Failure mode of the alloy during dynamic compression is adiabatic shear failure,adiabatic shear bands form at an angle of about 45° with the loading direction,and cracks initiate in the shear band and propagate with the increased strain, finally leading to alloy failure.
quote
| GB/T 7714-2015 | [1] SANG Qing-qing, LIU Jin-xu, HAO Yan-jun, et al. Investigation on Mechanical Properties and Failure Mechanism of Ti-22Al-15Nb Alloy[J]. Rare Metals and Cemented Carbides, 2017(2): 45-50. |
| MLA | [1] SANG Qing-qing, et al., "Investigation on Mechanical Properties and Failure Mechanism of Ti-22Al-15Nb Alloy." Rare Metals and Cemented Carbides, no. 2, 2017, pp. 45-50. |
| APA | [1] SANG Qing-qing, LIU Jin-xu, HAO Yan-jun, LI Jian-chong, & LI Shu-kui. (2017). Investigation on Mechanical Properties and Failure Mechanism of Ti-22Al-15Nb Alloy. Rare Metals and Cemented Carbides(2), 45-50. |
| IEEE | [1] SANG Qing-qing, LIU Jin-xu, HAO Yan-jun, LI Jian-chong, and LI Shu-kui, "Investigation on Mechanical Properties and Failure Mechanism of Ti-22Al-15Nb Alloy," Rare Metals and Cemented Carbides, no. 2, pp. 45-50, 2017. keywords: {Ti-Al based alloy;Ti-22Al-15Nb;dynamic mechanical behavior;shear band;failure mechanism} |