生物医用Ti-24Nb-4Zr-8Sn单晶合金塑性变形行为研究

doi:10.11900/0412.1961.2017.00255

金属学报

2017, Vol. 53

Issue (10): 1385-1392 DOI: 10.11900/0412.1961.2017.00255

研究论文

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生物医用Ti-24Nb-4Zr-8Sn单晶合金塑性变形行为研究

张金睿^1,², 张晏玮³, 郝玉琳¹(

), 李述军¹, 杨锐¹

1 中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016
3 苏州热工研究院有限公司寿命管理技术中心苏州 215004

Plastic Deformation Behavior of Biomedical Ti-24Nb-4Zr-8Sn Single Crystal Alloy

Jinrui ZHANG^1,², Yanwei ZHANG³, Yulin HAO¹(

), Shujun LI¹, Rui YANG¹

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3 Life Management Technology Center, Suzhou Nuclear Power Research Institute, Suzhou 215004, China

引用本文:

张金睿, 张晏玮, 郝玉琳, 李述军, 杨锐. 生物医用Ti-24Nb-4Zr-8Sn单晶合金塑性变形行为研究[J]. 金属学报, 2017, 53(10): 1385-1392.
Jinrui ZHANG, Yanwei ZHANG, Yulin HAO, Shujun LI, Rui YANG. Plastic Deformation Behavior of Biomedical Ti-24Nb-4Zr-8Sn Single Crystal Alloy[J]. Acta Metall Sin, 2017, 53(10): 1385-1392.

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摘要:

针对具有特殊非线弹性变形行为的高强度低模量Ti-24Nb-4Zr-8Sn (质量分数,%,简称Ti2448)医用钛合金,采用光学浮区生长法制备出3种典型取向的低指数单晶,研究其塑性变形行为。结果表明,Ti2448单晶合金的室温拉伸性能表现出明显的各向异性,<100>取向、<110>取向和<111>取向单晶的抗拉强度分别为650、642和889 MPa,延伸率分别约为73%、22%和13%;单晶合金的室温拉伸塑性变形机制以滑移为主,<100>取向单晶开动的滑移系统为(112)[111]、(112)[111]、(112)[111]和(112)[111],<110>取向单晶开动的滑移系统为(211)[111]和(211)[111],<111>取向单晶开动的滑移系统为(211)[111];<100>取向、<110>取向和<111>取向单晶合金的拉伸样品断口形状分别呈现矩形状、鸭嘴状和三角状,断裂面与拉伸方向的夹角均约为55°,断口均呈现韧性断裂特征。

关键词 ：生物医用金属, 钛合金, 单晶, 塑性变形

Abstract：

Excellent corrosion resistance, good biocompatibility and relatively low elastic modulus make Ti and Ti alloys fulfill the property requirements in the biomedical field better than other competing materials such as stainless steels. Even so, there still exist some problems to be solved such as the biological toxicity of some alloy elements and the so-called stress shielding effect caused by higher elastic modulus than that of human bone. In response to these issues, several metastable β-type Ti alloys were developed with the advantage of nontoxicity and a much lower elastic modulus. Ti-24Nb-4Zr-8Sn (mass fraction, %, abbreviated Ti2448) alloy is a multifunctional biomedical Ti alloy with high strength and low elastic modulus, which makes it show great application prospect in the field of body implant. It put up obvious nonlinear elasticity and highly localized plastic deformation behavior. Study on deformation behavior of single crystal can help to understand the deformation mechanism of polycrystalline alloy. In this work, Ti2448 single crystal alloy along three different orientations were prepared by optical floating zone method. The plastic deformation behaviors of them under tensile stress were investigated in terms of mechanical properties, slip system and fracture morphology. Results show that Ti2448 single crystal shows obvious anisotropy, the tensile strengths along <100>, <110> and <111> orientations are 650, 642 and 889 MPa, respectively, while the elongations are about 73%, 22% and 13%, respectively. The main plastic deformation mechanism of Ti2448 single crystal alloy is by slip. The appearance of slip bands and its direction relationship with crystal orientation were detailed observed. Under tensile stress, the operated slip systems for <100>, <110> and <111> orientation single crystals are (112)[111]/(112)[111]/(112)[111]/(112)[111], (211)[111]/(211)[111] and (211)[111], respectively. This is in accordance with the law of critical shearing stress. SEM analyses show a fracture surface shape of rectangle, duckbilled and triangle for the <100>, <110> and <111> orientation single crystals, respectively. The intersection angle between fracture surface and loading direction is all about 55 degree, and a lot of dimple was detected that show ductile fracture mode.

Key words： biomedical metal titanium alloy single crystal plastic deformation

收稿日期: 2017-06-29

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目Nos.51571190、51271180、51631007和51527801,国家高技术研究发展计划项目No.2015AA033702及国家重点研发计划专项项目Nos.2016YFC1102600和2017YFC1104903

作者简介:

作者简介张金睿,男,满族,1993年生,博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00255 或 https://www.ams.org.cn/CN/Y2017/V53/I10/1385

Orientation	LD	TD	ND
<100>	[001]	[100]	[0 $1 ?$ 0]
<110>	[011]	[0 $1 ?$ 1]	[100]
<111>	[ $1 ?$ 11]	[01 $1 ?$ ]	[211]

表1 Ti2448单晶合金板状拉伸样品与晶向指数的对应关系

表2 Ti2448合金不同取向单晶体单轴拉伸性能

Orientation	Slip system	Schmid factor
<100>	(112)[11 $1 ?$ ] / ( $1 ?$ 12)[1 $1 ?$ 1] / (1 $1 ?$ 2)[ $1 ?$ 11] / (11 $2 ?$ )[111]	0.471
<110>	(211)[ $1 ?$ 11] / ( $2 ?$ 11)[111]	0.471
<111>	( $1 ?$ 12)[1 $1 ?$ 1] / ( $1 ?$ 21)[11 $1 ?$ ] / ( $2 ?$ 11)[111]	0.314

表3 Ti2448合金不同取向单晶体拉伸时具有最大Schmid因子的滑移系统

图1 Ti2448合金<100>取向单晶拉伸时开动滑移系统的确定

图2 Ti2448合金<110>取向单晶拉伸时开动滑移系统的确定

图3 Ti2448合金<111>取向单晶拉伸时开动滑移系统的确定

图4 不同取向Ti2448单晶合金拉伸样品断裂后的SEM侧视像

图5 不同取向Ti2448单晶合金拉伸样品宏观断口形貌的SEM像

图6 不同取向Ti2448单晶合金拉伸样品微观断口形貌的SEM像

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