Microstructure Evolution of Ti-6Al-4Fe-0.25Si through Aging Heat Treatment

被引：4

作者：

Song, Yong Hwan ^{[1
,2
]}

Kang, Joo-Hee ^{[1
]}

Park, Chan Hee ^{[1
]}

Kim, Seong-Woong ^{[1
]}

Hyun, Yong-Taek ^{[1
]}

Kang, Nam Hyun ^{[2
]}

Yeom, Jong-Taek ^{[1
]}

机构：

[1] Korea Inst Mat Sci, Titanium Dept, Chang Won 642831, South Korea

[2] Pusan Natl Univ, Dept Mat Sci & Engn, Pusan 609735, South Korea

来源：

KOREAN JOURNAL OF METALS AND MATERIALS | 2012年 / 50卷 / 07期

关键词：

titanium; TiFe intermetallic compound; aging; precipitation; electron backscatter diffraction (EBSD); TI-6AL-4V; DEFORMATION; TITANIUM;

D O I：

10.3365/KJMM.2012.50.7.477

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of aging heat treatment on microstructure evolution of the Ti-6Al-4Fe-0.25Si alloy with an initial microstructure of an elongated alpha was investigated. Aging treatments of the samples were carried out at 550 degrees C for up to 100 hours. The microstructure of the 5 hours heat-treated sample consisted of alpha grains, beta matrix and some TiFe intermetallic compounds that were precipitated from the beta matrix. Increasing the aging time to 10 hours, most of the beta matrix was decomposed to very fine alpha grains (similar to 0.5 mu m) and TiFe, and thus the volume fraction of the beta matrix was significantly decreased. EBSD analysis revealed that newly formed tertiary-alpha-grains in the vicinity of TiFe had high angle boundaries with respect to the primary and secondary alpha grains. As a result of these phase transformations during aging, the fraction of the alpha/alpha grain boundary was increased while that of the alpha/beta phase boundary was decreased.

引用

页码：477 / 485

页数：9