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高温处理对Ti-25Al-25Nb（原子百分比）体系金属间化合物的结构相态和力学性能的影响

Effect of a High-Temperature Treatment on Structural-Phase State and Mechanical Properties of IMC of the Ti-25Al-25Nb at.% System.

作者信息

Skakov Mazhyn, Kozhakhmetov Yernat, Mukhamedova Nurya, Miniyazov Arman, Sokolov Igor, Urkunbay Azamat, Zhanbolatova Gainiya, Tulenbergenov Timur

机构信息

National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, Kazakhstan.

Institute of Atomic Energy Branch of the National Nuclear Center of the Republic of Kazakhstan, Kurchatov KZ-071100, Kazakhstan.

出版信息

Materials (Basel). 2022 Aug 12;15(16):5560. doi: 10.3390/ma15165560.

DOI:10.3390/ma15165560
PMID:36013698
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9415817/
Abstract

In this research, samples of an alloy with a bimodal structure were studied on the basis of a previously developed technology for obtaining hydrogen storage materials based on the Ti-Al-Nb system. The results of SPS of mechanically activated powder mixtures of the Ti-Al-Nb system at a temperature of 1300 °C make it possible to obtain an alloy with a predominantly bimodal structure. However, an insignificant presence of TiAl, AlNb phases, and unreacted niobium is still observed in the structure. The mechanical properties of alloys of the Ti-Al-Nb system after sintering show abnormally low values of strength and ductility (less than 150 MPa). Two-stage heat treatment of alloys of the Ti-Al-Nb system leads to the decomposition of large precipitates of TiAl with the formation of O-phase nuclei, as well as to the complete dissolution of unreacted niobium and AlNb phases. Heat treatment of alloys of the Ti-Al-Nb system contributes to an increase in its strength by approximately 10 times (1310 MPa, MA-180), and ductility by 2 times (1322 MPa, MA-20). The surface fracture of samples obtained after testing is characterized by intergranular (intercrystalline) brittle fracture with "river" or "step" features.

摘要

在本研究中，基于先前开发的基于Ti-Al-Nb体系制备储氢材料的技术，对具有双峰结构的合金样品进行了研究。在1300℃温度下对Ti-Al-Nb体系的机械活化粉末混合物进行放电等离子烧结（SPS）的结果，使得能够获得一种主要具有双峰结构的合金。然而，在该结构中仍观察到TiAl、AlNb相以及未反应铌的微量存在。Ti-Al-Nb体系合金烧结后的力学性能显示出强度和延展性的值异常低（小于150MPa）。Ti-Al-Nb体系合金的两阶段热处理导致TiAl大析出物分解并形成O相核，同时未反应的铌和AlNb相完全溶解。Ti-Al-Nb体系合金的热处理使其强度提高约10倍（1310MPa，MA-180），延展性提高2倍（1322MPa，MA-20）。测试后获得的样品的表面断裂特征为具有“河流”或“台阶”特征的沿晶（晶间）脆性断裂。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aba0/9415817/4e699d9930f8/materials-15-05560-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aba0/9415817/27adce178682/materials-15-05560-g010.jpg
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