Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

被引：1
|
作者：
Hsu, H-C [1 ]
Wong, K-K [2 ]
Chen, J-S [2 ]
Wu, S-C [1 ]
Ho, W-F [2 ]
机构：
[1] Cent Taiwan Univ Sci & Technol, Dept Dent Technol & Mat Sci, Taichung 40601, Taiwan
[2] Natl Univ Kaohsiung, Dept Chem & Mat Engn, Kaohsiung 81148, Taiwan
来源：
KOVOVE MATERIALY-METALLIC MATERIALS | 2021年 / 59卷 / 06期
关键词：
titanium alloys; biomaterials; cold working; aging; hardness; BETA-TITANIUM ALLOYS; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; FATIGUE-STRENGTH; YOUNGS MODULUS; TI ALLOY; BEHAVIOR; MICROSTRUCTURES; INITIATION; HARDNESS;
D O I：
10.4149/km_2021_6_357
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, different thermomechanical treatment conditions were used to improve the mechanical performances of Ti-25Nb-8Sn. During cold rolling treatment (50, 75, and 90 %), as-cast Ti-25Nb-8Sn underwent a stress-induced phase transformation from a single beta phase to a three-phase structure of alpha '' + beta + omega(str). After the subsequent aging treatment, Ti-25Nb-8Sn presents three-phase beta + alpha '' + omega(iso). (at 250 and 400 degrees C, for 30 min) and two-phase beta + alpha (at 600 degrees C, for 30 min). At lower aging temperatures (250 and 400 degrees C), yield strength/modulus (x 1000) ratios of Ti-25Nb-8Sn are dramatically improved with a maximum increase of 143 %, from 9.06 (as-cast) to 16.2-22.0. Under various thermomechanical treatment conditions in this study, the results show that Ti-25Nb-8Sn has excellent yield strength/modulus (x 1000) ratio (similar to 22) and corrosion resistance after 90 % cold rolling and subsequent aging treatment at 250 and 400 degrees C for 30 min.
引用
收藏
页码：357 / 366
页数：10
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