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(. + .&) ” #$%& ‘( ) * +,

!” #$ %&’ ( : ( 3 43 5 (α+γ) , -./ 0 %1′ 2 )$ *+ (” 9: , ;<=: (1+ 0 >: ? , . 0 6 -7/ B =A: B5?$ 0 2 )$ = CD = 9: EBSD @$ G C !” D H= . 0 6 2E?$ -F$ -= 0 >: %$ I/: J>=A B – #$ ( -F= -=K0 #$ L BML – , N ‘ Ti Nb $ # D EBSD H= . ; 5 ; : – L ;, (1+ .: L$ Nb # , % 2 )$ *+ (” C 3 ;: 5 – ( ;, -P – .: N ;: 5 , =<O 5
U/V U/R CT/R Q$$ – Nb-Ti 5 Nb 5
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F EW$ CEBSD C- ;, C0 2 )$ C 5 :
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Downloaded from ijiepm.iust.ac.ir at 16:55 IRST on Saturday November 4th 2017

Downloaded from ijiepm.iust.ac.ir at 16:55 IRST on Saturday November 4th 2017

X = CX = N B X: *>X? X E 6 -X C5 ( F K_ : (1+ =: ( N lX:$ Ti CNbX .[m] _=jX =: L =X: $=: , bU :[n CV] ,X X AX$ -X XL G -=K0 # $ 0XNL X# l:$ bT C; 2″ 4$ ;, p’ # l:$ -X ;X *XE? BX -X ( C* . B : X XL rX?$ sX ;XN %M – , Lq F +: ;X tX: B – ( C M h . EX – , C2 ) $ L : ( GX6 sX QX $$ ( X .N L L r?$ ;N s+F$
X AX$ -X GX ; /=: F EW$
.[u n Cm] ,
-=jX$ -N ;N \0 $..?$ ;0 ( f CA L: XX5 CXX$ XXM LXX , ;<=XX: XX XX X VX , X – ;, – N ;: -X3 X: ;X ;X C M L ( v:: . N ‘ : X -?=X: GX6 C – Qw

.
X X X -X XN – Y? #$ PA – ;, -X[“> 2X 6 P – \ ( C5 B5Y? :L ZA X0 : ; ; -P – . 6 (..? -M$ N X X U X” X$ L =A: – = X X5 ]E=^ G , , 7$ $ ;_ C+
.[Uba] 3 (_M – N ;: 5 +6 0 C4 X) X , J C( 3 43 5 JX/7 X_.f C?=X: X .$ X[ -X (4 . 4=$
X X$ BX E+ F g+N – ZA ( . :L K’
. F 5 ( 0X0 X= C( N WN $ 2
_=jX Y G – iL WN $ 2 B h C
X X lX:$ D^ ?=: k: .

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4X: LAX: (X , XN X , .X 0 ;,X xX 6 XP –
lX:$ G.LX: X X ; XW (N type) 2’N$ X 0 , /A . 0 ;, + P – 2’N$ ;_=X: @X lX:$ X0 2X X)$ LD, . ±V °C ”
BqM =D B>P Qj3 . 0 F 0 %1′
.3 -7M [}…] sM – $ ;_=: (

/ , – +) *$%& ‘( .”#
(4 5 *67 %8) 201&

%18 ‘;& .!! BE+ – x6 “P C5 0 2 )$ (7$ 5 ? ;? : € = C$ 0 C6(Tnr) F EW$ bU :, $W ( .0 $ F EW$ ( , $5 5 2 )$ ( , $ (‘ 2 )$ 0 Ch .= <$ =: G bT C0 + B =: F EW$ C -./ , 5 : (” C(Ar3) – =: -?=: G – C: ( ” – -=6 ==: , $5 $W – .N =: , , 2D$ – ( , : ==: =A: C ( ‘ ba =: , PE^ =A: ( 5 5 0 C(Ar1) – =: -?=: =: . C ;> =A: ;_ C ?
;_ C ( , =+N 5 0 Ch . A M
. M =: . † =A: + 0 %1′ 2 )$ *+ , ;<=: x.?$ ( (7$ 5 -: ? C(CCTT) -=:’ : (” p‡: ; 0 %’ 5 = \ ( .0 } $ ) :’ f 2 )$ ?$ C0 %’ , : – 2 )$ =’ _ . – (+€ .= 0 6 (k’ Vƒ°C , :2 )$ G bU : -= 0 [ , B Tƒ :2 )$ L:’ 2N 7$ bT C0 %’ , =’
1268732040128

Downloaded from ijiepm.iust.ac.ir at 16:55 IRST on Saturday November 4th 2017

Downloaded from ijiepm.iust.ac.ir at 16:55 IRST on Saturday November 4th 2017

X XF EW$ , – =: %N ?$ -X : ; \0 .[RbUm] X -X $=X: X X $ , xP f
( +=:) , -./ 2 )$ F , 7
:[Un CUV] K_ #$
bT C -= 2 ) $ – Lq F -=j % bU
XN L xP , -= 2 ) $ , : %N X X -X F ba C Lq F z$ QM Lq F r?$ .X ;XN F EW$ – : %N bm C xP , – N {W$ D L: X: k=: =+3 B>P 4(‘ 0 2 )$ -X #$ .[UubU|] l ( #$ v$+ C – .: -= 0 F $7/ 2 )$ ‘ , 7 $=: X -X X X 3K #$ {W$ C_
,X -X./ 2 )$ M l
.[}b}~] : ; D= =+3 B>P (α+γ)
4=$ 4 !” #$ €” %&’ X (X1+ X X0 2 )$ = ( 3 43 5 @ *X+ (X” C – ;X X: (α+γ) ,X -X./ 0 %1′ 2 )$ , ;<=X: X (X1+ X0 >X: X X? , .: EBSD X DX X= 9X: 9:
-X= 0 X6 2XE?$ -XF$ ;= <$ =A: B5?$ .:

! .
.! 4X3 5X , X N ;: ( N 4N 5 g , x.?$ ( .X ;<=X: 4 X=$ b 4 X 4 X ( 3 -/+ .: ; ‚ 5 -: + Q3$ (U) *M .X: 4L -W 5 -: -‘ + QN$ ; -X (X , .: ; t^= sM 5 – N ;: 5 C JX” X N ;: 5 CY=A LM -. :$: 7
NT N JX” Q$= Nb-Ti Nb 5
X0 X -+jX$ B – 5 ( = . A ; D
%, =: -+ -+j$ ( , $ ; X , X =: 0 %1′ -+ .0 -L$ 0 %1′ X/6 (G.L) -F: * P ;, . ; -+j$ LM
X X 0 ;,X . n/u mm Tƒ mm Q$$ – -+ EA „: -+ L= C2 )$ (” -+ GX -X ” $ : LA: ( L= . -W7$ , 2 )$ -./ B)$ = -P – C – G.L
4 !” #$ % &’ ()$ *+, -./0 1+,2
= 9: l:$ EBSD B7/ C 9:
20 kV ;X t=X X= X Field Emission Gun G D -X+ I/X: , -” ;, . 0 F HKL – LF
210 μm × 150 μm X X X 0 6 -7/ \ ( -3 -P – . 0 B 3 ( ./a μm step size
‚^=X: I/X: , -X/. 350000 7$ B>P C-+
.0

T
n

Temperature

Time
Reheating temp / 120
sec

(
γ
)

(
α

+

W.Q

A
r
A
r
1
ε
=

/
s
,
0.5
2
ε
=

0.01
, 1

ε



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