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NIU Qiulin,CHEN Ming,MING Weiwei.Experimental study on quasi-static tensile mechanical properties of TC11 titanium alloy at room temperature[J].Journal of Hebei University of Science and Technology,2017,38(4):320-324
室温下TC11钛合金准静态拉伸力学性能实验研究
Experimental study on quasi-static tensile mechanical properties of TC11 titanium alloy at room temperature
Received:February 24, 2017  Revised:March 16, 2017
DOI:10.7535/hbkd.2017yx04002
中文关键词:  材料力学  TC11钛合金  准静态拉伸  力学性能  断口形貌
英文关键词:mechanics of materials  TC11 titanium alloy  quasi-static tension  mechanical properties  fracture morphology
基金项目:国家自然科学基金(51605161,51405294);湖南科技大学科研启动基金(E51660);难加工材料高效精密加工湖南省重点实验室开放基金(E21639)
Author NameAffiliationE-mail
NIU Qiulin College of Mechanical and Electrical Engineering Hunan University of Science and Technology Xiangtan qlniu2009@163.com 
CHEN Ming School of Mechanical Engineering Shanghai Jiao Tong University  
MING Weiwei School of Mechanical Engineering Shanghai Jiao Tong University  
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中文摘要:
      针对典型航空材料TC11钛合金的拉伸性能,采用准静态拉伸实验对不同应变率条件下的TC11钛合金的应力-应变关系进行了研究,利用扫描电镜分析了其拉伸断口形貌。实验结果表明:TC11钛合金具有一定的应变率敏感性,抗拉强度和屈服强度均会受到应变率的影响;准静态拉伸时TC11钛合金试样出现了颈缩现象,试样截面形状为杯锥状,试样断口存在光滑的剪切唇区和灰色的纤维区,其断裂属于韧性断裂,但是其韧性较差;TC11钛合金拉伸断口形貌主要为大小不一的韧窝,随着应变率的增大,试样拉伸断口韧窝的大小和深度均变小,同时出现了少量的撕裂棱和准解理面,试样的断裂机制为以韧性断裂为主和伴有准解理断裂。因此,在准静态拉伸条件下,TC11钛合金的力学行为与应变率有关。
英文摘要:
      According to the tensile properties of typical aerospace material TC11 titanium alloy, the stress-strain relationship is studied using the quasi-static tensile test at different strain rates, and the tensile fracture morphology is analyzed with SEM. The experimental results show that TC11 titanium alloy has certain strain rate sensitivity, and both tensile strength and yield strength are affected by strain rate. During quasi-static tension test, TC11 titanium alloy specimen has the phenomenon of neck shrinkage. The section of the specimen is cuppy, and there is smooth shear lip zone and grey fiber area in the sample fracture. The fracture of the samples belongs to ductile fracture, but its toughness is poor. The tensile fracture morphology of TC11 titanium alloy is mainly the dimple with different sizes, but with the increase of strain rate, the size and the depth of dimple at the tensile fracture are smaller, and the fracture surface produces a small number of tearing edges and quasi-cleavage plane, and the fracture mechanism of the specimen is mainly ductile fracture and quasi-cleavage fracture. Therefore, the mechanical behavior of TC11 titanium alloy is related to strain rate under quasi-static tensile condition.
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