龚思恒,董显娟,徐勇,鲁世强.真空烧结温度对Ti-44Al-2Cr-4Nb-0.2W-0.2B合金显微组织及力学性能的影响[J].稀有金属材料与工程,2021,50(8):2950~2956.[Gong Siheng,Dong Xianjuan,Xu Yong,Lu Shiqiang.Effect of Vacuum Sintering Temperature on the Microstructure and Mechanical Properties of Ti-44Al-2Cr-4Nb-0.2W-0.2B Alloy[J].Rare Metal Materials and Engineering,2021,50(8):2950~2956.]
真空烧结温度对Ti-44Al-2Cr-4Nb-0.2W-0.2B合金显微组织及力学性能的影响
投稿时间:2020-09-08  修订日期:2020-10-26
中文关键词:  Ti-44Al-2Cr-4Nb-0.2W-0.2B合金  烧结温度  显微组织  力学性能
基金项目:航空科学基金(2019ZE056009); 江西省重点研发计划(20202BBEL53012)
中文摘要:
      为获得细晶TiAl合金及有效减少传统铸造带来的内部缺陷,本文采用真空热压烧结工艺制备了Ti-44Al-2Cr-4Nb-0.2W-0.2B合金,研究了烧结温度对TiAl合金微观组织及力学性能的影响。实验结果表明: Ti、Al元素粉末反应合成后,经XRD检测,三种烧结温度(1150 ℃、1240 ℃、1300 ℃)烧结后的合金主要由γ-TiAl和α2-Ti3Al两种基体相组成,随着烧结温度的增加,γ相含量增加,α2相则减少;结合SEM观察发现,改变烧结温度可获得TiAl合金不同典型组织,其中1150 ℃烧结合金为近γ组织、1240 ℃烧结为双态组织、1300 ℃烧结为近片层组织,烧结温度的升高使得合金组织愈发均匀;配合EDS分析,烧结温度的升高有助于Nb元素在基体相中的扩散,同时合金密度随烧结温度的升高逐步增加,当烧结温度升至1300 ℃,合金的密度达到4.419 g/cm3;通过力学性能检测,在1240 ℃烧结制备的TiAl合金组织为细小的双态组织,显示出较好的综合力学性能,其显微硬度为527 HV,在高温压缩时展示出良好的抗压强度。
Effect of Vacuum Sintering Temperature on the Microstructure and Mechanical Properties of Ti-44Al-2Cr-4Nb-0.2W-0.2B Alloy
英文关键词:Ti-44Al-2Cr-4Nb-0.2W-0.2B alloy  sintering temperature  Microstructure  Mechanical properties
英文摘要:
      In order to obtain fine-grained TiAl alloy and effectively reduce internal defects caused by traditional casting,in this paper, the Ti-44Al-2Cr-4Nb-0.2W-0.2B alloy was prepared by vacuum hot pressing sintering process, and the effect of sintering temperature on the microstructure and mechanical properties of TiAl alloy was studied. The results show that according to Ti and Al element powder reaction synthesis mechanism, the alloys sintered at three temperatures (1150 ℃, 1240 ℃, 1300 ℃) are mainly composed of γ and α2 phases after XRD inspection. With the increase of sintering temperature, the content of γ phase increases, and that of α2 phase decreases. Combined with SEM observation, it is found that different typical structures of TiAl alloy can be obtained by changing the sintering temperature. The sintered alloy at 1150 ℃ with a near-gamma structure, at 1240 ℃ with a dual-state structure, and at 1300 ℃ with a near-lamellar structure, the microstructure is become more uniform with the increasing sintering temperature. With EDS analysis, the density of the alloy increases gradually and the Nb element in the matrix phase is diffusied more homogeneously with the increasing sintering temperature. When the sintering temperature rises to 1300 ℃, the density of the alloy reaches to 4.419 g/cm3. Through mechanical property testing, the TiAl alloy sintered at 1240 ℃ shows better comprehensive mechanical properties with a microhardness of 527 HV at room temperature and good compressive strength at high temperatures.
作者单位E-mail
龚思恒 南昌航空大学航空制造工程学院 1162731474@qq.com 
董显娟 南昌航空大学航空制造工程学院 dxj3@163.com 
徐勇 南昌航空大学航空制造工程学院 xuyong@nchu.edu.cn 
鲁世强 南昌航空大学航空制造工程学院 niatlusq@126.com 
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