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234 ^11108 Hltr-Br=9 4^l o-tr., =cg 4-60/o,Lt4 o.ZS-0.30/oMn Fg 'J+6Iq ol *s6I+. dC r+ €d ol *f all .fl^l^J 71. Mg-Al-ZnAl -Et= (1) 39 EL+ ^J4E tr? 1o-7olg Me-At-znA) Et+g 3 ?l oJ? ^JEilEtr^l ^Jgq glq^l Mg€ ql H g a^JE iL*iI7I €4la]-_1, At4 Zn*4) 9alr'l Mg,7Al12, Mgrr( Al,Zn)noe) ElaJEol e=+4. zntlol 4g =Cql ^ .1 = Mg,rAl,rElBE ol Zntlol r*olxl H Mgrr( Al,zn)+09 E]6JEol e=+4. Al 5 -lOo/o, Zn l-3o/o* -g.oJ6l= oJ? Srlg! 4 ql 9 rtlr.l 7)A)4 C 4 ol z|] d €+. AZ63A, AZ8LA, AZ9IA, AZ}IA Et+ Fol .l+9+. 3gAl Et+g Et+ =c"il trl+ EIELEE €EIzI ge-lzlq, Mg4 AloJ+ql zn! e 7I6IE i=^J4ql,<.1 tlzt zSo14r qJ4Col ++6J Et+g gg + 91u}. (2) Me-Ar-Znal ( A263A) El+ =4 t r B 10-711g =C ol At 5.3 -6 .T o/o, zn 2.5 -3.5, Mn 0.15 -0.60/o, 44 zl zI MgE!+ s -tr -J+B g Mg-At-Zn(Elecktron; AZ63A) ol tr}. =4 g Mgr*ol 9 "J Al ql 6I.J r]^JE *CMgrr(At,zn)olBEol +4+q, "IlHlf EIEIEE +Bql +B+^JE 4 =Eol +Elt =zl ol+. +4g ++t}(ae^J) 2g, +++ 1000m1-E EIHtrI. olzlt 'J"g .ll 9zlt9 yl.Eql ^I+q= {ufsg zgqllCg 6}C'^l7lzl 96Iq 9+ "1ts*g *tltl7)a, +4+ ols Fg tslEL6Iq +{gE= +olq, eEe+ zlEE fzl,r1ztr T49E olg, 7ly# Fg ?ztfl4. (3) Mg-AI-Znz{ ( AZ1LA)EI+ =zl trH r0-7zl= =C ol AI 8.1 -9.3o/o, zn 0.4-r.oo/o, Mn 0.13 -o.so/o, ul"lzlzl Mgol q, Et+B g MI-AI-Zn(AZ9LA) ol 4. =4g a e .J 4lql Mgr*xil eI Mg,,Ar129 i|- e=4 ol +4t =4 o=. aairJ4ql gatl ee"Jal .7lql ,\r, zng FEzI +tr}. u| :rLllf ElEtEq +Hql ele+^JE 4=Eol +Elu =zlol+. +4"_lg +gt(aa Mg510 15 -:.aJ 10-70 Mg-Al-ZnAl -st=et 3fl -st= SEtlE a : Mgq(AltZn) n Mg+MgZn