X �� h X �� � Vol��� No���

���� � �� z X �������� Y ACTA METALLURGICA SINICA Dec� ���� pp���������

�f��RPt Al�Cu LU��Os� �

��� ���� ��� �� ��� ��

� �� � � �� ��� �� ��� ��

�� �SGE��mEr��Ex��S ������

�� ��mExQsLb�ZT��mE�� ���� �Sj�ZT ������

y v e� Al����Cu � Al���Cu��tw� �RV�U�P�E�I��Mc� AlCu �R���S�

�K��U�P�E�I�� Al����Cu �RS����iep Al���Cu �R��DZ ��YkS�

Ot�b�a���KGgSYk � �Al�Cu� �� ����w�RS� m�s�� Gam�

FQ AlCu �R�U�P�E�I������ Ga�gADYH TG� ��� TG���� jn�c� A jz�H � �����������������������

IMPACT PROPERTIES OF Al�Cu ALLOY SUBJECTED TO

EQUAL CHANNEL ANGULAR PRESSING

FANG Daran����� DUAN Qiqiang��� HUANG Chongxiang��� WU Shiding��� ZHANG Zhefeng���LI Jiajun��� ZHAO Naiqin��

�� School of Materials Science and Engineering� Tianjin University� Tianjin �������� Shenyang National Laboratory for Materials Science� Institute of Metal Research� Chinese Academy of Sciences�

Shenyang ������

Correspondent� ZHANG Zhefeng� professor� Tel� ������������� E�mail� zhfzhang�imr�ac�cnSupported by National Natural Science Foundation of China �Nos����� and ������Manuscript received �������� in revised form ��������

ABSTRACT Impact properties of the casting Al�����Cu and Al�� �Cu �mass fraction� alloyssubjected to equal channel angular pressing �ECAP� were investigated� It is found that the impactproperties of Al�����Cu alloy were enhanced after ECAP� while for Al�� �Cu alloy� its impacttoughness was not improved due to more � �Al�Cu� phases� although the tensile strength increasedbecause of grain re�nement and dispersive precipitation of the secondphase� It is shown that theimpact toughness is dependent on the static toughness of the AlCu alloys�KEY WORDS AlCu alloy� equal channel angular pressing �ECAP�� impact properties� static

toughness

T�O�D�H �ECAP� �thW�wl��wR���R����pm ���� v�ta�����f���I��T����D��C ���h ��� R�O��

�OCI���FFR�����h�koI�����

o�d��U�f��H�vpm��R��Y��E��� ��� nm� �m �����J��Y�� ���� d

ECAP ��RJ��Y���D��RKa���W��ouX��xp� ������� �R���J��Y��R

uX�����JNX���BV����R�����

� ���DnF�R�� �������� � �������� ��mN� I � ����� ��� mN�y I � ��������

�� N � rHD�!� ���� "#�!e#

�����"#$�����G!����J��Y�������G!M"�$��d��xo% z�hd�

�xo%BV� ECAP #R!$�zo�xR&d��

x���Ch�M�����%T&M ECAP ��%'

��p�RKa� l(o AlSi )P ECAP #%'�

� zR&O ��������

Al *&)PhfMSdi!�+oRlQPr���fl%fj'R"��L(�#'(��z'',R)

*��'',R$���-��'j'R"$���.H��T ����� +)P)&%/R�W)P*sos� Al

Mg &'AlSi &� AlCu &T�Su+)P��AlCu

)Ph�0p�,SdiF+R)P��Wio+pF'1RJ23�,�RBi Cut-/.�(R�� AlCu

)P�Ka ECAP �z#)PR%'���* Cu /.