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In-situ processing of aluminum nitri...

Zheng, Qingjun.

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In-situ processing of aluminum nitride particle reinforced aluminum alloy composites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	In-situ processing of aluminum nitride particle reinforced aluminum alloy composites./
Author:	Zheng, Qingjun.
Description:	175 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 4012.
Contained By:	Dissertation Abstracts International64-08B.
Subject:	Engineering, Metallurgy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3101783

In-situ processing of aluminum nitride particle reinforced aluminum alloy composites.
Zheng, Qingjun.

In-situ processing of aluminum nitride particle reinforced aluminum alloy composites. - 175 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 4012.

Thesis (Ph.D.)--The University of Alabama, 2003.

Discontinuously reinforced aluminum alloy composites (DRACs) have potential applications in automotive, electronic packaging, and recreation industries. Conventional processing of DRACs is by incorporation of ceramic particles/whiskers/fibers into matrix alloys. Because of the high cost of ceramic particles, DRACs are expensive.Subjects--Topical Terms:

1023648
Engineering, Metallurgy.

In-situ processing of aluminum nitride particle reinforced aluminum alloy composites.
LDR:03247nmm 2200349 4500 001 1866094
005 20041220114122.5
008 130614s2003 eng d
035 $a (UnM)AAI3101783
035 $a AAI3101783
040 $a UnM $c UnM
100 1 $a Zheng, Qingjun. $3 1953509
245 1 0 $a In-situ processing of aluminum nitride particle reinforced aluminum alloy composites.
300 $a 175 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 4012.
500 $a Chairperson: Ramana G. Reddy.
502 $a Thesis (Ph.D.)--The University of Alabama, 2003.
520 $a Discontinuously reinforced aluminum alloy composites (DRACs) have potential applications in automotive, electronic packaging, and recreation industries. Conventional processing of DRACs is by incorporation of ceramic particles/whiskers/fibers into matrix alloys. Because of the high cost of ceramic particles, DRACs are expensive.
520 $a The goal of this work was to develop a low-cost route of AlN-Al DRACs processing through bubbling and reacting nitrogen and ammonia gases with aluminum alloy melt in the temperature range of 1373--1523 K.
520 $a Thermodynamic analysis of AlN-Al alloy system was performed based on Gibbs energy minimization theory. AlN is stable in aluminum, Al-Mg, Al-Si, Al-Zn, and Al-Li alloys over the whole temperature range for application and processing of DRACs.
520 $a Experiments were carried out to form AlN by bubbling nitrogen and ammonia gases through aluminum, Al-Mg, and Al-Si alloy melts. Products were characterized with XRD, SEM, and EDX. The results showed that in-situ processing of AlN reinforced DRACs is technically feasible. Significant AlN was synthesized by bubbling deoxidized nitrogen and ammonia gases.
520 $a When nitrogen gas was used as the nitrogen precursor, the AlN particles formed in-situ are small in size, (<10 mum). The formation of AlN is strongly affected by the trace oxygen impurities in the nitrogen gas. The deleterious effect of oxygen impurities is due to their inhibition to the chemisorption of nitrogen gas at the interface.
520 $a In comparison with nitrogen gas, bubbling ammonia led to formation of AlN particles in smaller size (about 2 mum or less) at a significantly higher rate. Ammonia is not stable and dissociated into nitrogen and hydrogen at reaction temperatures. The hydrogen functions as oxygen-getter at the interface and benefits chemisorption of nitrogen, thereby promoting the formation of AlN.
520 $a The overall process of AlN formation was modeled using two-film model. For nitrogen bubbling gas, the whole process is controlled by chemisorption of nitrogen molecules at the gas bubble - aluminum melt interface. For ammonia precursor, the rate of the overall process is limited by the mass transfer of nitrogen atoms in the liquid boundary layer. The models agree well with the experimental results.
590 $a School code: 0004.
650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Automotive. $3 1018477
690 $a 0743
690 $a 0794
690 $a 0540
710 2 0 $a The University of Alabama. $3 1019361
773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Reddy, Ramana G., $e advisor
790 $a 0004
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3101783