退火温度对冷轧<strong>Ti-13V-3Al-0.5Cu</strong>形状记忆合金组织结构与马氏体相变的影响

doi:10.11901/1005.3093.2020.164

材料研究学报

2020, Vol. 34

Issue (10): 721-729 DOI: 10.11901/1005.3093.2020.164

研究论文

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退火温度对冷轧Ti-13V-3Al-0.5Cu形状记忆合金组织结构与马氏体相变的影响

孙馗善¹, 李珺², 孟祥龙¹(

), 蔡伟¹

1.哈尔滨工业大学材料科学与工程学院哈尔滨 150006
2.东北林业大学机电工程学院哈尔滨 150040

Effect of Annealing Temperature on Microstructure and Martensitic Transformation of Cold Rolled Ti-13V-3Al-0.5Cu Shape Memory Alloy

SUN Kuishan¹, LI Jun², MENG Xianglong¹(

), CAI Wei¹

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150006, China
2. College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China

引用本文:

孙馗善, 李珺, 孟祥龙, 蔡伟. 退火温度对冷轧Ti-13V-3Al-0.5Cu形状记忆合金组织结构与马氏体相变的影响[J]. 材料研究学报, 2020, 34(10): 721-729.
Kuishan SUN, Jun LI, Xianglong MENG, Wei CAI. Effect of Annealing Temperature on Microstructure and Martensitic Transformation of Cold Rolled Ti-13V-3Al-0.5Cu Shape Memory Alloy[J]. Chinese Journal of Materials Research, 2020, 34(10): 721-729.

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摘要:

使用XRD、TEM、DSC和室温拉伸等分析测试手段，对冷轧后经不同退火温度处理的Ti-13V-3Al-0.5Cu(%，原子分数)合金微观组织结构，马氏体相变行为，力学性能和形状记忆性能进行了研究。经冷轧、退火处理后，合金在室温下的组织主要为α"马氏体相，存在少量残余β母相、α相和Ti₂Cu第二相。随着退火温度的增加，合金形状记忆性能先升高后降低；当退火温度为750℃时，在预应变量为6%的前提下可实现5.3%的可回复应变。其组织结构观察结果表明，经冷轧、退火处理后，合金中α"马氏体形貌由“V”字型自协作组态向择优取向的单一取向马氏体板条转化，界面可动性提升，马氏体临界再取向应力降低，形状记忆性能提高。

关键词 ：金属材料, Ti-V-Al-Cu, 轻质记忆合金, 组织结构

Abstract：

The effect of post annealing temperature on the microstructure, martensitic transformation behavior, mechanical properties and shape memory effect of the cold rolled Ti-13V-3Al-0.5Cu (%, atomic fraction) alloy was systematically studied by means of XRD, TEM, DSC and tensile test at room temperature. The results showed that the phase composition of the alloy at room temperature was mainly α" phase, together with a small amount of remained β phase, α phase and Ti₂Cu second phase. With the increasing annealing temperature, the shape memory property increased firstly and then decreased. When the annealing temperature is 750℃, the alloy showed a good shape memory effect and the recoverable strain up to 5.3% when the pre-strain was 6%. Furthermore, the morphology of martensite transformed from a V-shape like self-coordinated-structure to a structure of single preferential orientation when the alloy was subjected to a proper cold rolling and annealing treatment. Lower reorientation critical stress and better interface mobility were the main causes for the improvement of shape memory effect.

Key words： metallic materials Ti-V-Al-Cu light-weight shape memory alloy microstructure

收稿日期: 2020-05-14

ZTFLH:

TG15

基金资助:国家自然科学基金(51871080);国家自然科学基金(51571073)

作者简介: 孙馗善，男，1995年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.164 或 https://www.cjmr.org/CN/Y2020/V34/I10/721

图1 合金拉伸样示意图

图2 冷轧后经不同温度退火Ti-13V-3Al-0.5Cu合金的室温X-射线衍射图谱

图3 Ti-V-Al-Cu的透射电镜明场像及其电子衍射花样

C.V.	[100]_α_"	[010]_α_"	[001]_α_"
CV1	[100]_β	[011]_β	[0 $1 ˉ$ 1]_β
CV2	[ $1 ˉ$ 00]_β	[0 $1 ˉ$ 1]_β	[011]_β
CV3	[010]_β	[101]_β	[10 $1 ˉ$ ]_β
CV4	[0 $1 ˉ$ 0] _β	[10 $1 ˉ$ ]_β	[101]_β
CV5	[001]_β	[110]_β	[ $1 ˉ$ 10]_β
CV6	[00 $1 ˉ$ ]_β	[ $1 ˉ$ 10]_β	[110]_β

表1 马氏体相变中马氏体变体与母相的取向关系

C.V.	T_i	C.V.	T_i
CV1	$0.9374 00 0 1.0051 - 0.0032 0 - 0.0032 1.0051$	CV2	$0.9374 00 0 1.0051 0.0032 0 1.0051 0.0032$
CV3	$1.0051 0 0.0032 0 0.9374 0 0.0032 0 1.0051$	CV4	$1.0051 0 - 0.0032 0 0.9374 0 - 0.0032 0 1.0051$
CV5	$1.0051 0.0032 0 0.0032 1.0051 0 00 0.9374$	CV6	$1.0051 - 0.0032 0 - 0.0032 1.0051 0 00 0.9374$

表2 马氏体变体与母相的晶格畸变矩阵

图4 Ti-V-Al-Cu合金中的自协作形貌示意图

图5 冷轧后经不同温度退火Ti-13V-3Al-0.5Cu合金的DSC曲线

图6 冷轧后经不同温度退火Ti-13V-3Al-0.5Cu合金的应力-应变曲线以及退火温度对强度及断裂应变的影响

图7 冷轧后经不同温度退火Ti-13V-3Al-0.5Cu合金预变形量为6%的应力-应变曲线

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