TC4钛合金蜂窝板高温力学性能  

High Temperature Mechanical Properties of TC4 Titanium Alloy Honeycomb Panel

作　　者：商磊 薛启超 杨大春 邹广平 李垚[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001 [2]哈尔滨工程大学,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2018年第2期567-573,共7页Rare Metal Materials and Engineering

摘　　要：采用钎焊工艺制备了TC4钛合金蜂窝板,对试样在室温和高温下进行异面压缩、三点弯曲性能测试和分析,并对不同温度下的试件强度及破坏模式进行分析。研究表明,钛合金蜂窝板的异面压缩模量与强度随着测试温度的升高而下降,440℃时保有室温时的35.2%、61.7%。但测试温度对破坏模式没有影响。而三点弯曲测试中,随着测试温度的升高,破坏模式发生改变,抗弯曲强度不断下降,最大挠度不断增加。且L向试件的弯曲性能明显高于W向试件。室温下弯曲试件面板为韧性断裂,钎焊区为脆性断裂,而300℃下试件面/芯脱粘区的断口为解理断口。TC4 titanium alloy honeycomb sandwich panel was prepared by high-temperature brazing. The mechanical performance parameters and failure modes of the honeycomb sandwich panel were experimentally investigated via flatwise compression and three-point bending test at different temperatures. Results show that flatwise compression elasticity modulus and strength of the honeycomb sandwich panel at 440 ℃ decrease to 35.2% and 61.7% of that at room temperature, respectively, indicating that higher temperature may result in lower compression elasticity modulus and strength. The test temperature has no effect on the failure mode. The failure mode changes in the three-point bending test, the flexural strength decreases, and the maximum deflection increases with the increasing test temperature. The bending performance of specimens in the L-direction is better than that in the W-direction. In addition, the face sheet of the bending specimen is ductile fracture, and the brazing zone is brittle fracture at room temperature, while the brazing joint of surface/core debonding failure specimen is cleavage fracture at high temperature of 300 ℃.

关 键 词：TC4蜂窝板 钎焊 高温 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TB383[金属学及工艺—金属材料]