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Transient processing and characteriz...

Moussa, Sherif Omar Hassan.

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Transient processing and characterization of advanced materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Transient processing and characterization of advanced materials./
作者:	Moussa, Sherif Omar Hassan.
面頁冊數:	169 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6295.
Contained By:	Dissertation Abstracts International64-12B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3115572

Transient processing and characterization of advanced materials.
Moussa, Sherif Omar Hassan.

Transient processing and characterization of advanced materials. - 169 p.

Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6295.

Thesis (Ph.D.)--University of Missouri - Columbia, 2003.

The current study involves investigating the transient reactive processing of Ni3Al from nickel (Ni) and aluminum (Al) elemental metal powder during reaction synthesis (RS). The effect of incorporating ternary elements (interstitial) was also examined to produce boron-doped nickel-rich Ni3A1 with boron additions up to 2.0 wt %. Two transient reactive processes were studied; Reaction Pressing (RP) and a new process called Reaction Extrusion (RE) by which a near fully dense Ni3Al was simultaneously formed and shaped. These are seen as low-energy alternative to the hot processing of Ni3Al. Materials characterization was conducted using X-ray and Neutron diffraction, SEM/EDS, WDS, Image analysis and Archimedes principle.Subjects--Topical Terms:

783786
Engineering, Mechanical.

Transient processing and characterization of advanced materials.
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245 1 0 $a Transient processing and characterization of advanced materials.
300 $a 169 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6295.
500 $a Supervisor: Khaled Morsi.
502 $a Thesis (Ph.D.)--University of Missouri - Columbia, 2003.
520 $a The current study involves investigating the transient reactive processing of Ni3Al from nickel (Ni) and aluminum (Al) elemental metal powder during reaction synthesis (RS). The effect of incorporating ternary elements (interstitial) was also examined to produce boron-doped nickel-rich Ni3A1 with boron additions up to 2.0 wt %. Two transient reactive processes were studied; Reaction Pressing (RP) and a new process called Reaction Extrusion (RE) by which a near fully dense Ni3Al was simultaneously formed and shaped. These are seen as low-energy alternative to the hot processing of Ni3Al. Materials characterization was conducted using X-ray and Neutron diffraction, SEM/EDS, WDS, Image analysis and Archimedes principle.
520 $a In the reactive sintering of B-doped Ni3Al, boron was found to rapidly dissolve during the reaction (leaving no residual boron) and occupy the grain boundaries as well as the Ni3Al superlattice (at boron content up to 0.3 wt %), in addition to combining with Ni and Al to form a complex boride (Ni41Al5B12) matrix above 0.5wt% content. Grain boundary strengthening, solid solution hardening and the formation of boride phase contributed to the observed increase in Rockwell hardness of Ni3Al with boron additions.
520 $a The application of consolidation/deformation pressure was found to be most beneficial after the compact had reached the maximum combustion temperature and is cooling down. In the RP study, different consolidation pressures (100, 200 and 300 MPa) were applied to the reacted compact during cooling at different temperatures. It was found that with increasing pressing temperature and pressure, the percentage total porosity decreased reaching its minimum value of &sim;1% at 1200°C and 300 MPa respectively.
520 $a The grain size was almost independent of both pressing temperature and pressure. (Abstract shortened by UMI.)
590 $a School code: 0133.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Materials Science. $3 1017759
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790 1 0 $a Morsi, Khaled, $e advisor
790 $a 0133
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3115572