%0 Journal Article
%T EFFECTS OF B~+ IMPLANTATION ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF POLYCRYSTALLINE Ni
%A CHEN Lifan BA Tu SHI Changxu State Key Laboratory for Fatigue
%A Fracture of Materials
%A <br>CHEN Lifan BA Tu SHI Changxu State Key Laboratory for Fatigue and Fracture of Materials
%A Institute of Metal Research
%A Academia Sinica
%A Shenyang
%A China Doctorate Student.Institute of Physics.Academia Sinica
%A Beijing
%A China
%J 金属学报(英文版)
%D 1993
%I 
%X 50 keV B~+ ions was implanted to polycrvstalline with 50 keV B~+ to a dose o/ 3x 10~17 ions/cm~2 at room temperature.The specimens with and without B~+implantation were tested in micro-hardness and load or unload tensile fatigue under stress-controlled eondition. The surface layer structure was observed with IMA,SEM and TEM before and after implantation and/or fatigue.The B~+ implanted surface region consists of amorphous Ni-B phase,Ni_3B and Ni_4B_3 second phases,and damage structure.The corresponding measurements indicate that both surface micro-hardness and endurance limit of the specimens have increased after implantation.Compared with unimplanted specimens under the same fa- tigue condition,all implanted specimens show the smallest overall fatigue danage.The cyclic loading at room temperature can lead to migration of implanted B~+ out surface layer and reerystallization of amorphous Ni-B phase,Possible strengthening mechanisms.for these ex- perimental results were discussed.
%K ion implantation
%K fatigue
%K polycrystalline Ni
%K implanted layer<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=9DA272BB3939FD9A046E1C8DEADC10EE&yid=D418FDC97F7C2EBA&vid=B31275AF3241DB2D&iid=0B39A22176CE99FB&sid=7AA74D31F1FF2DCE&eid=C753EB8AC8F551B9&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=9