Semisolid Microstructural Evolution during Partial Remelting of a Bulk Alloy Prepared by Cold Pressing of the Ti-Al-2024Al Powder Mixture

被引：11

作者：

Qin, Yahong ^{[1
]}

Chen, Tijun ^{[1
]}

Wang, Yingjun ^{[1
]}

Zhang, Xuezheng ^{[1
]}

Li, Pubo ^{[1
]}

机构：

[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China

来源：

MATERIALS | 2016年 / 9卷 / 03期

基金：

中国国家自然科学基金;

关键词：

microstructural evolution; Al-p-Ti-p-2024Al(p) bulk alloy; powder thixoforming; partial remelting; in situ; Al3Ti phase; stress calculating; Al-Ti diffusion reaction; ALUMINUM-MATRIX COMPOSITES; AZ91D MAGNESIUM ALLOY; MECHANICAL-BEHAVIOR; FABRICATION;

D O I：

10.3390/ma9030199

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new method, powder thixoforming, has been proposed to fabricate an in situ Al3Tip/2024Al composite. During partial remelting, the microstructural evolution of the bulk alloy prepared by cold pressing of the Ti, Al, 2024Al powder mixture was investigated, and the formation mechanism of the Al3Ti particles produced by the reaction between the Ti powder and the Al alloy melt is also discussed in detail. The results indicate that the microstructural evolution of the 2024 alloy matrix can be divided into three stages: a rapid coarsening of the powder grains; a formation of primary -Al particles surrounded with a continuous liquid film; and a slight coarsening of the primary -Al particles. Simultaneously, a reaction layer of Al3Ti can be formed on the Ti powder surface when the bulk is heated for 10 min at 640 degrees C The thickness (X) of the reaction layer increases with the time according to the parabolic law of X = -0.43t(2) + 4.21t + 0.17. The stress sigma(Al3Ti) = -E-Al3Ti/6(1-v(Al3Ti)) t(Al3Ti)(2)/t(Ti) (1/R - 1/R-0). Comparing the obtained data with the results of the drip experiment, the reaction rate for the Ti powder and Al powder mixture is greater than that for the Ti plate and Al alloy mixture, respectively.

引用

页数：17

共 35 条

[1]

Adamiak M, 2004, J MATER PROCESS TECH, V155, P2002, DOI 10.1016/j.jmatprotec.2004.04.292

[2]

Bolz R. E., 1970, HANDBOOK OF TABLES F

[3]

Chawla N, 2001, ADV ENG MATER, V3, P357, DOI 10.1002/1527-2648(200106)3:6<357::AID-ADEM357>3.0.CO

[4]

2-I

[5] Effect of initial as-cast microstructure of AZ91D magnesium alloy on its semisolid microstructure [J].

Chen, T. J. ;

Jiang, X. D. ;

Ma, Y. ;

Li, Y. D. ;

Hao, Y. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2010, 505 (02) :476-482

[6] Microstructural evolution and phase transformations during partial remelting of AZ91D magnesium alloy refined by SiC [J].

Chen, T. J. ;

Jiang, X. D. ;

Ma, Y. ;

Li, Y. D. ;

Hao, Y. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2010, 497 (1-2) :147-154

[7] Effect of honeysuckle extract for color protection of human hair exposed to sunlight radiation [J].

Chen, Yuan ;

Li, Qiong ;

Zhang, Wan-ping ;

Cui, Jian-jie ;

Wu, Xiao-jian .

ADVANCES IN TEXTILE ENGINEERING AND MATERIALS III, PTS 1 AND 2, 2013, 821-822 :28-+

[8] Micro structural features and mechanical properties of Al-Al3Ti composite fabricated by in-situ powder metallurgy route [J].

Chianeh, V. Abbasi ;

Hosseini, H. R. Madaah ;

Nofar, M. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 473 (1-2) :127-132

[9]

Clyne T. W., 1993, AN INTRODUCTION TO M

[10] Semisolid metal processing [J].

Fan, Z .

INTERNATIONAL MATERIALS REVIEWS, 2002, 47 (02) :49-85

← 1 2 3 4 →