Characterization of a new type grain boundary phase in near-β titanium alloys

被引：7
|
作者：
Zhang, Hongling [1 ]
Zhang, Xiaoyong [1 ]
Zhu, Zhishou [2 ]
Li, Chao [3 ]
Zhou, Kechao [1 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
[2] AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
[3] Xiangtou Goldsky Titanium Ind, Changsha 410015, Hunan, Peoples R China
来源：
SCRIPTA MATERIALIA | 2020年 / 177卷
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Titanium alloys; Aging; Phase transformation; Crystal structure; omega ' phase; OMEGA-PHASE; VARIANT SELECTION; MECHANICAL-PROPERTIES; HIGH-STRENGTH; ALPHA; PRECIPITATION; TRANSFORMATIONS;
D O I：
10.1016/j.scriptamat.2019.10.020
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
After 920 degrees C/120min -> WQ+ 780 degrees C/300 min --> air fast cooling heat treatment, a banded omega' phase distributing at interfaces between the beta matrix and grain boundary alpha phase was discovered in a Ti-4.5Al-6.5Mo-2Cr-2.5Nb-2Zr-1Sn (wt%) alloy. The omega' phase shows a P6/mmm hexagonal close packed lattice crystal structure and its lattice parameters are a = 0.399 nm, c = 0.282nm. The orientation relationship between omega' and adjacent beta phase are (110)beta 1//(1 (1) over bar 00)(omega'), (111)beta(1)//(0001)(omega'), and (112)(beta 1)//(11 (2) over bar0)(omega'). The atom migration path during the beta -> omega' (.0' phase is (121)(beta) plane collapse along the <010>beta direction. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：118 / 122
页数：5
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