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Ni 3 Al ! " #$ %&’ * ’( % ) ** %*+, - % .( /( 0+, 1 ) ! : # / / % &’( )*( ! : + / + / , ( %*2 3 ! "#$ ! %&%’( &% % )* +%, - Ni 3 Al ) /0 1 2 "#$ ( *4 5 , $ . $7 ", 8& + , Ni 3 Al % 9%&%’( :;%< #&= $7 > ;%<; ?%’( , "@ . A BC5 Ni 3 Al 1 Al ?’ D , % ! $ E $7 @ " . F%&%’( $7 > ", Ni 3 Al A* $ MPa 200 $ GA H$A* $ °C /I0 * J MPa I20 " , K0 "<"@ &% L%5$ . MG;A7 DA7 @ N , BC5 ) & ’OP & M< Q;;% M, <;’ 7;;% A*4 5 , $ . ABC5 $ A $$ RA< SA< * T HU= , $$ $V : )%P< "#$ H"@ % Ni 3 Al +O &; &% $ . A %, "V * W&&% %= +%! $ $$ R< " @< +%, X& Ni 3 Al ’( &% %&% < $ @ $ . "A%’ A BC5 << R)% @$ Y’ 9%&%’( << , Z[< \, H"@ * ! "#$ X)* , Ni 3 Al X)* ", . .45) % : M%&%’( &% Al-Ni 3 Al M % ,- % )* + << M ][ An Investigation of the Use of Ni 3 Al Intermetallic Compound for Fabrication of Al Matrix Composites M. H. Enayati and M. Salehi Department of Materials Engineering, Isfahan University of Technology Abstract: Fabrication and characterization of aluminum matrix composites containing different volume fractions of Ni 3 Al Powder (5-40 Vol%) were investigated. Ni 3 Al powder was produced by mechanical alloying of elemental nickel and aluminum powder mixture. Al-Ni 3 Al composite parts were prepared using a powder metallurgy route involving two stages; Al and Ni 3 Al powder mixtures were first compacted under 500MPa and then hot-pressed under 250MPa at 420 o C for 10min. The microstructure and hardness of consolidated parts were investigated by x-ray diffractometery, optical and scanning electron microscopy and * % ! ** % ! Downloaded from jame.iut.ac.ir at 21:42 IRST on Tuesday February 13th 2018

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An Investigation of the Use of Ni3Al Intermetallic Compound for Fabrication of Al Matrix Composites

M. H. Enayati and M. Salehi

Department of Materials Engineering, Isfahan University of Technology

Abstract: Fabrication and characterization of aluminum matrix composites containing different volume fractions of Ni3Al Powder (5-40 Vol%) were investigated. Ni3Al powder was produced by mechanical alloying of elemental nickel and aluminum powder mixture. Al-Ni3Al composite parts were prepared using a powder metallurgy route involving two stages; Al and Ni3Al powder mixtures were first compacted under 500MPa and then hot-pressed under 250MPa at 420 oC for 10min. The microstructure and hardness of consolidated parts were investigated by x-ray diffractometery, optical and scanning electron microscopy and

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hardness measurements. Results showed that consolidated Al-Ni3Al samples included no significant porosity with a nearly uniform distribution of Ni3Al particles. Additionally, structural examinations showed that no significant reaction between Ni3Al and aluminum matrix occurred during sintering process. Al-Ni3Al composites exhibited a higher hardness value compared with pure aluminum sample prepared under identical conditions. The hardness value of Al-Ni3Al composites increased linearly as Ni3Al content increased. Keywords: Al matrix composites, Al-Ni3Al, Intermetallic compound, Nanocrystalline.

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پودر نيكل

پودرآلومينيم

آلياژ سازيمكانيكي

غربال كردن مخلوط كردن

(آسياب كاري)

فشردن سرد)MPa500(

سينترينگmin)10oC420MPa 250(

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C� B8�8�C�?!.

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&� 3 4� �7� .

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_`���

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��� �������� ��� ������� ���� �+k

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�s.0 �&� ��G .�.~ �5�8a� �.6 �<�8K!�t /.�"I.8=9F �T�.�

54^� W87 Ni3Al �&18(�.1� 56��A�8�? p^�)� i 9� ! "

(! &���'� E�1D(! �^o� �^d �&�/!9� E�bD�sE ��.� �

�S ���%�������.

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