热处理对超细晶Ti-55511近β钛合金显微组织和力学性能的影响

稀有金属, 2015, 44(2): 327-332.

热处理对超细晶Ti-55511近β钛合金显微组织和力学性能的影响

1.中南大学粉末冶金国家重点实验室,湖南长沙,410083

2.中南大学粉末冶金国家重点实验室,湖南长沙,410083

3.中南大学粉末冶金国家重点实验室,湖南长沙,410083

4.中南大学粉末冶金国家重点实验室,湖南长沙,410083

基金项目: the Major Science and Technology Project of Hunan in China (2010F51004) the Graduate Research and Innovation Project of Hunan (CX2012B044) National Natural Science Foundation of China (51021063) Forward Research Projects in Central South University (2009QZZD007)

关键词： Ti-55511合金 , 超细晶 , 热处理 , 组织 , 性能

Effect of Heat Treatment on Microstructure and Mechanical Properties of Ultra-fine Grained Ti-55511 Near β Titanium Alloy

Keywords： Ti-55511 alloy , ultra-fine grain , heat treatment , microstructure , mechanical property

采用热轧制备晶粒尺寸为0.1～0.5 μm超细晶Ti-55511近β钛合金,利用SEM、TEM等手段研究热处理工艺对超细晶合金显微组织和力学性能的影响.结果表明,在350～650℃的温度条件下,合金强度和硬度随温度的增加呈现先增高后降低的趋势,在450℃达到峰值1486 MPa;在450℃温度退火时,随着退火时间的延长,合金强度首先急剧上升至1536 MPa后趋于稳定,延伸率呈现先增加后下降的趋势.显微组织分析表明,合金在退火过程中主要发生回复现象,未发生明显的粗化长大现象,晶粒尺寸均＜lμm.回复过程在消除加工硬化的同时促进了晶界/相界的稳定化,提高细晶强化作用;退火过程中发生的α→α2和β→ω→α相变过程,第二相粒子弥散强化效应增强.但是当第二相粒子尺寸增加至一定尺寸时,会显著降低合金的塑性.退火过程中合金力学性能的变化与强化机制的作用有关.

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