%0 Journal Article
%T PLASTIC DEFORMATION AND DISLOCATION STRUCTURE IN γ''''-PHASE OF A DIRECTIONALLY SOLIDIFIED Ni-BASE SUPERALLOY
%A WEN Mao LIN Dongliang T.L.Lin Shanghai Jiaotong University
%A Shanghai
%A China LIN Dongliang Professor
%A Shanghai Jiaotong University
%A Shanghai
%A China
%J 金属学报(英文版)
%D 1990
%I 
%X The dislocation structure of directionally solidified(DS)Rene 80 superalloy during tensileand creep deformation has been studied by TEM.In tensile deformation,γ'shearing occurs byslip of APB-coupled(1/2)<110>dislocation pairs on{111}planes at temperatures below760℃.and by slip of SISF-seperated(1/3)<112>superpartials which have dissociated on{111}planes into a(1/2)<110>screw superpartial and a(1/6)<112>edgesuperpartial with an APB in between at temperatures equal to or above 760℃.In creepdeformation,γ'shearing occurs again by slip of SISF-seperated(1/3)<112>superpartialswhich have not dissociated on{111}planes and by diffusive slip of APB-coupled(1/2)<110>dislocation pairs at 760℃,618 MPa.However,no γ'shearing occurs at 980℃,190MPa.During secondary creep at 760℃,618 MPa or at 980℃,190 MPa,2-dimensional net-works have formed at γ/γ'interfaces,and the strain is mainly the result of diffusion control-led climb of dislocation networks at γ/γ'interfaces.The dependence of secondary creep rate εupon size a and volume fraction v_■ of cubic γ' has been found to be ■∝α/v_f~(2/3).
%K directional
%K solidification
%K alloy
%K DS
%K Rene'80
%K plastic
%K deformation
%K γ'phase
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=06AC7AA42B2839CCEE1C838501B0C2FB&yid=8D39DA2CB9F38FD0&vid=38B194292C032A66&iid=0B39A22176CE99FB&sid=9C65ADEB5990B252&eid=7E8E8B150580E4AB&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=10