Comparative study on superplastic tensile behaviors of the as-extruded Ti6Al4V alloys and TiBw/Ti6Al4V composites with tailored architecture
Comparative study on superplastic tensile behaviors of the as-extruded Ti6Al4V alloys and TiBw/Ti6Al4V composites with tailored architecture
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挤压态 Ti6Al4V 合金与定制结构 TiBw/Ti6Al4V 复合材料超塑性拉伸行为的对比研究
DOI：
10.1016/j.matdes.2015.12.162
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发表时间：
2016-03
影响因子：
8.4
通讯作者：
Geng L.
中科院分区：
文献类型：
--
作者：
Huang L.J.;Lu C.J.;Yuan B.;Wei S.L.;Cui X.P.;Geng L.
为了揭示Ti6 Al 4V合金的超塑性机制，对比研究了Ti6 Al 4V合金和具有定制结构的TiBw/Ti6 Al 4V复合材料的超塑性拉伸行为和机制。在900 °C、925 °C、950 °C和975 °C的温度下，分别以0.000316/s、0.001/s和0.00316/s的应变速率进行超塑性拉伸试验。复合材料具有较高的超塑性、应变速率敏感性指数和较低的激活能Q。这可能是由于小的片层纵横比和TiBw增强添加。显微组织观察表明，随着应变量的增加，Ti6 Al 4V合金中α相的长径比逐渐减小，仅在尖端区域转变为等轴晶。因此，颈缩不能被约束并转移到其他不利的微观组织位置，导致针状断口的宏观形貌。相反，TiBw/Ti6 Al 4V复合材料由于在小应变下完成了全球化过程，因此颈缩趋势较弱，这有助于大的延伸率。再结晶是导致TiBw/Ti6 Al 4V复合材料片层长径比减小和β相体积分数增加的主要协调机制。
The superplastic tensile behaviors and mechanisms of Ti6Al4V alloys and TiBw/Ti6Al4V composites with tailored architecture were comparatively studied in order to reveal the superplasticity mechanisms. The superplastic tensile tests were carried out at the temperatures of 900 °C, 925 °C, 950 °C and 975 °C with the strain rate of 0.000316/s, 0.001/s and 0.00316/s, respectively. The composites exhibited higher superplasticity, higher strain rate sensitivity indexmand lower activation energyQthan the alloys. This might be attributed to the small lamellar aspect ratio and TiBw reinforcement addition. Microstructural observation showed that the aspect ratio of α phase in the Ti6Al4V alloys decreased with increasing strains, and transferred to equiaxed grains only in the tip area. Therefore, necking could not be constrained and transferred to other positions with unfavorable microstructure, led to the needle-like fracture macro morphology. On the contrary, the TiBw/Ti6Al4V composites had weak necking tendency due to the globalization process completed at small strain, which contributed to the large elongations. Recrystallization should be responsible for the decrease in lamellar aspect ratio and increase in volume fraction of β phase, which are considered to be the major coordination mechanism of superplasticity for the as-extruded TiBw/Ti6Al4V composites.
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影响因子：
6
作者：
Minmin Wang;W. Lu;J. Qin;Di Zhang;B. Ji;F. Zhu
通讯作者：
Minmin Wang;W. Lu;J. Qin;Di Zhang;B. Ji;F. Zhu
影响因子：
3.1
作者：
J. Escobedo;S. Patankar;D. Field;F. Froes
通讯作者：
J. Escobedo;S. Patankar;D. Field;F. Froes
DOI：
10.4028/www.scientific.net/msf.243-245.609
发表时间：
1996-11
期刊：
Materials Science Forum
影响因子：
--
作者：
A. Mukherjee;R. Mishra
通讯作者：
A. Mukherjee;R. Mishra
影响因子：
9.4
作者：
Guo, Xianglong;Wang, Liqiang;Lu, Weijie
通讯作者：
Lu, Weijie
影响因子：
6
作者：
Koo, Min Young;Park, Jae Sung;Hong, Soon Hyung
通讯作者：
Hong, Soon Hyung