摘要
在常温下对经医用酒精浸泡过的TC4钛合金试样进行单轴拉伸实验和超声疲劳实验,以研究医用酒精溶液对TC4钛合金力学性能的影响。单轴拉伸实验结果表明酒精对TC4钛合金的单轴拉伸力学性能影响极小,而经酒精浸泡再放置一段时间后,TC4钛合金的屈服强度有一定的变化。超声疲劳疲劳试验结果表明TC4钛合金经酒精浸泡后,其疲劳性能明显下降。酒精对TC4钛合金力学性能影响,是由于医用酒精降低了TC4钛合金内局部塑性,钛合金在酒精溶液中发生渗氢反应,使钛合金固溶氢浓度增加,在外载荷作用下,氢向材料缺陷处扩散富集,形成氢脆降低了材料局部塑性。
The mechanical properties of TC4 Titanium alloy immersed in alcohol solution had been investigated by using the tensile test and the ultrasonic fatigue test. The results of tensile test show that alcohol has little influence on tensile properties of TC4 Titanium alloy, but the yield strength changes to a certain degree if the alloy deposited in air for a week after immersing＇ in medical alcohol. The results of fatigue test show that the fatigue property of TC4 Titanium alloy decline sharply after immersing in medical alcohol. The mechanical property of TC4 Titanium alloy changes with the reduction of plasticity within a small area, and then, the tensile properties change a little, and the fatigue life which is sensitive to changing of microstructure sharply reduce. Hydrogen permeates into TC4 alloy （Hydrogen Permeation Process） during the immersing, HPP raises the concentration of hydrogen in the alloy. Hydrogen diffuses to the defects of the material under the influence of the force act on specimen, and causes the hydrogen embrittlement.
出处
《中国测试》
CAS
2009年第4期4-6,共3页
China Measurement & Test
基金
国家自然基金项目(10872175)
西南交通大学科学研究基金项目(2007B06)
关键词
医用酒精
TC4钛合金
单轴拉伸
超声疲劳
渗氢
氢脆
Medical alcohol
TC4 titanium
Tensile
Ultrasonic fatigue
Hydrogen permeation process
Hydrogen embritflement
