Nitinol 60形状记忆合金高温变形特性研究

舒小勇; 胡林丽; 鲁世强; 李贵发; 王克鲁

doi:10.15980/j.tzzz.2017.06.004

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Nitinol 60形状记忆合金高温变形特性研究
High Temperature Deformation Characteristics of Nitinol 60 Shape Memory Alloy Based on Processing Map
2017年37卷第6期页码：593-597
纸质出版日期： 2017 ，
DOI： 10.15980/j.tzzz.2017.06.004

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[1]舒小勇,胡林丽,鲁世强,李贵发,王克鲁.Nitinol 60形状记忆合金高温变形特性研究[J].特种铸造及有色合金,2017,37(06):593-597.

Shu Xiaoyong, Hu Linli, Lu Shiqiang, et al. High Temperature Deformation Characteristics of Nitinol 60 Shape Memory Alloy Based on Processing Map[J]. Special Casting & Nonferrous Alloys, 2017,37(6):593-597.
[1]舒小勇,胡林丽,鲁世强,李贵发,王克鲁.Nitinol 60形状记忆合金高温变形特性研究[J].特种铸造及有色合金,2017,37(06):593-597. DOI： 10.15980/j.tzzz.2017.06.004.

Shu Xiaoyong, Hu Linli, Lu Shiqiang, et al. High Temperature Deformation Characteristics of Nitinol 60 Shape Memory Alloy Based on Processing Map[J]. Special Casting & Nonferrous Alloys, 2017,37(6):593-597. DOI： 10.15980/j.tzzz.2017.06.004.

摘要

采用Gleeble-3500热模拟试验机对轧态Nitinol 60形状记忆合金进行等温恒应变速率拉伸试验

基于动态材料模型的加工图技术

研究了该合金在650

50℃和0.01

-1

范围内的高温变形特性

并优化了其适宜的高温变形参数范围。结果表明

加工图中失稳区位于低温、高应变速率区

范围为650

76℃、0.075

-1

对应的失稳现象为局部塑性流动。加工图中有2个η峰值区

范围分别为690

50℃、0.01

.026 4 s

-1

和750

38℃、0.01

.050 5 s

-1

η最大值分别达到了0.36和0.38

对应的变形机制均为动态再结晶

这2个区域为Nitinol 60合金适宜的热拉伸变形工艺参数范围。

Abstract

The hot tensile deformation of Nitinol 60 shape memory alloy was conducted with Gleeble-3500 thermal simulation machine at 650

850 ℃ and 0. 01

1 s

-1

. The processing maps were constructed and hot working parameters were optimized based on the generated processing map. The results show that there exists a single unstable region at 650

776 ℃ 、0. 075

1 s

-1

associated with flow localization in the processing map. The optimized hot working conditions correspond to 690

750 ℃ 、0. 01

0. 026 4 s

-1

with peak efficiency of 0. 35 at 720℃ 、0. 01 s

-1

and 750

838 ℃、0. 01

0. 050 5 s