Thermal stability of Al-12Ti-6Nb alloy prepared by mechanical alloying

Dechang Jia; Yu Zhou; Tingquan Lei

Thermal stability of Al-12Ti-6Nb alloy prepared by mechanical alloying

Dechang Jia^*
, Yu Zhou
, Tingquan Lei

^*Corresponding author for this work

Harbin Institute of Technology
Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The microstructure was observed through optical microscope, electron microprobe and the variation of Vickers hardness with thermal exposure time has been also studied for mechanically alloyed (MA) Al-12Ti-6Nb exposed at 550°C in air atmosphere. The results show that the MA Al-12Ti-6Nb alloy manifests excellent thermal stability at 5501. After the alloy is exposed for 200 h at 550°C, the α-Ti cores trans form into Al ₃Ti nearly completely, and the primary, cake-shaped Al ₃Ti becomes ellipsoidal. The coarsening of Al ₃Ti particles was achieved through the α-Ti/ Al ₃Ti phase boundary moving inward and the Al ₃Ti/ Al phase boundary outward controlled by Ti and Al atoms diffusion through the surrounding Al ₃Ti band between α-Ti and Al matrix. However, the flat Nb particles still stably exist with only a little increase in Al element within them. The Vickers hardness doesn't decrease for the alloy exposed for 50 h at 550°C, and still retains nearly 90% of its primary values for the alloy exposed for 200 h at 550°C.

Original language	English
Pages (from-to)	29
Number of pages	1
Journal	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume	26
Issue number	4
State	Published - 1997

Keywords

Al-12Ti-6Nb
Mechanical alloying
Microstructure
Thermal stability

Cite this

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title = "Thermal stability of Al-12Ti-6Nb alloy prepared by mechanical alloying",

abstract = "The microstructure was observed through optical microscope, electron microprobe and the variation of Vickers hardness with thermal exposure time has been also studied for mechanically alloyed (MA) Al-12Ti-6Nb exposed at 550°C in air atmosphere. The results show that the MA Al-12Ti-6Nb alloy manifests excellent thermal stability at 5501. After the alloy is exposed for 200 h at 550°C, the α-Ti cores trans form into Al 3Ti nearly completely, and the primary, cake-shaped Al 3Ti becomes ellipsoidal. The coarsening of Al 3Ti particles was achieved through the α-Ti/ Al 3Ti phase boundary moving inward and the Al 3Ti/ Al phase boundary outward controlled by Ti and Al atoms diffusion through the surrounding Al 3Ti band between α-Ti and Al matrix. However, the flat Nb particles still stably exist with only a little increase in Al element within them. The Vickers hardness doesn't decrease for the alloy exposed for 50 h at 550°C, and still retains nearly 90\% of its primary values for the alloy exposed for 200 h at 550°C.",

keywords = "Al-12Ti-6Nb, Mechanical alloying, Microstructure, Thermal stability",

author = "Dechang Jia and Yu Zhou and Tingquan Lei",

year = "1997",

language = "英语",

volume = "26",

pages = "29",

journal = "Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering",

issn = "1002-185X",

publisher = "Science Press ",

number = "4",

}

TY - JOUR

T1 - Thermal stability of Al-12Ti-6Nb alloy prepared by mechanical alloying

AU - Jia, Dechang

AU - Zhou, Yu

AU - Lei, Tingquan

PY - 1997

Y1 - 1997

N2 - The microstructure was observed through optical microscope, electron microprobe and the variation of Vickers hardness with thermal exposure time has been also studied for mechanically alloyed (MA) Al-12Ti-6Nb exposed at 550°C in air atmosphere. The results show that the MA Al-12Ti-6Nb alloy manifests excellent thermal stability at 5501. After the alloy is exposed for 200 h at 550°C, the α-Ti cores trans form into Al 3Ti nearly completely, and the primary, cake-shaped Al 3Ti becomes ellipsoidal. The coarsening of Al 3Ti particles was achieved through the α-Ti/ Al 3Ti phase boundary moving inward and the Al 3Ti/ Al phase boundary outward controlled by Ti and Al atoms diffusion through the surrounding Al 3Ti band between α-Ti and Al matrix. However, the flat Nb particles still stably exist with only a little increase in Al element within them. The Vickers hardness doesn't decrease for the alloy exposed for 50 h at 550°C, and still retains nearly 90% of its primary values for the alloy exposed for 200 h at 550°C.

AB - The microstructure was observed through optical microscope, electron microprobe and the variation of Vickers hardness with thermal exposure time has been also studied for mechanically alloyed (MA) Al-12Ti-6Nb exposed at 550°C in air atmosphere. The results show that the MA Al-12Ti-6Nb alloy manifests excellent thermal stability at 5501. After the alloy is exposed for 200 h at 550°C, the α-Ti cores trans form into Al 3Ti nearly completely, and the primary, cake-shaped Al 3Ti becomes ellipsoidal. The coarsening of Al 3Ti particles was achieved through the α-Ti/ Al 3Ti phase boundary moving inward and the Al 3Ti/ Al phase boundary outward controlled by Ti and Al atoms diffusion through the surrounding Al 3Ti band between α-Ti and Al matrix. However, the flat Nb particles still stably exist with only a little increase in Al element within them. The Vickers hardness doesn't decrease for the alloy exposed for 50 h at 550°C, and still retains nearly 90% of its primary values for the alloy exposed for 200 h at 550°C.

KW - Al-12Ti-6Nb

KW - Mechanical alloying

KW - Microstructure

KW - Thermal stability

UR - https://www.scopus.com/pages/publications/24044550352

M3 - 文章

AN - SCOPUS:24044550352

SN - 1002-185X

VL - 26

SP - 29

JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

IS - 4

ER -

Thermal stability of Al-12Ti-6Nb alloy prepared by mechanical alloying

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Keywords

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