Liquid state infrared processing of SCS-6/Ti-6Al-4V composites
- PDF / 1,045,903 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 36 Downloads / 178 Views
S.G. WARRIER. formerly Postdoctoral Fellow, Department of Materials Science and Engineering, University of Cincinnati, is Research Scientist. UES, Inc., Dayton. OH 45432. R.Y. LIN, Professor, is with the Department of Materials Science and Engineering, University" of Cincinnati. Cincinnati. OH 45221. S.K. WU, Professor, is with the Institute of Materials Science and Engineering, National Taiwan University. Taipei 10764, Taiwan. Manuscript submitted February. 14. 1995. MET:\LI.UR(IICAL AND MAFERI.XLS I'RANSACTIONS B
T a b l e I.
E x p e r i m e n t a l C o n d i t i o n s d u r i n g tile RI31 P r o c e s s
Sample
Number Coating Matrix TMC1 Carbon-rich coating* Ti-6A1-4V* TMC2 TiC on carbon-rich coating Ti-6AI-4V* TMC3 TiC on carbon-rich coating Ti-6AI-4V + 2 wt pet C TMC4 TiC on carbon-rich coating Ti-6A1-4V + 0.5 wt pet C *Materials in the as-receivedcondition. 2000 I
s"-~
G 1500
%,
1000
y. 500
0
, , , ,1,, 0
10
, , I , , ~, I , , , , I , , , , 20
30
40
I,, 50
, ,I ,,, 60
~ 70
T i m e (seconds) Fig. I - - A typical heating and cooling curve during infrared processing of Ti-6AI-4V composites.
Fig. 2--Cross section of SCS-6 fiber-reinforced Ti-6AI-4V composite (TMCI) produced by the RIM process at 1700 ~ for 5 s.
molten metal attack on fibers during liquid infiltration of Ti-6AI-4V matrix composites at temperatures around 1700 ~ even with very fast processes such as the RIM process. Consequently, our efforts are directed toward the development of suitable coatings and alloy additions to retard the reaction, without causing major modifications in the process or the matrix microstructure, and hence provide sufficient time for infiltration. It is to be noted that due to the rapid nature of the process, both the thickness of the coating and the amount of alloy addition required are expected to be rather small. VOLUME 2713, .IUNL: 10')r -527
9
%;
OBB4
8888
15 8KU
15.8Kq
XI,BBB
XI,808
IO~'m
8BB9
15.81(0
XI,B~B
9
1Stem :~
18~i
Fig. 3 Micrographs of electron microprobe analysis of the interface in SCS-6 fiber-reinforced Ti-6AI-4V composite (TMC1): (a) secondary electron image, (b) titanium map, (c) aluminum map, (d) vanadium map, (e) carbon map, (f) silicon map, (g) oxygen map, and (h) and (i) elemental line scans.
Fig. 4---Micrograph of the sputter-deposited TiC layer on the SCS-6 fiber.
SCS-6 fibers (142/zm in diameter with a 3-~m carbonrich coating) from Textron Specialty Materials (Lowell, MA) were cut and aligned into monolayer preforms with a 528--VOLUME 27B, JUNE 1996
Fig. 5--Micrograph of the interface in TiC-coated SCS-6 fiber-reinforced Ti-6A1-4V composite (TMC2) produced by the RIM process at 1700 ~ for5 s.
length of 35 mm and a fiber-to-fiber spacing of 300 /xm (center to center). One set of these fibers was retained in METALLURGICAL AND MATERIALS TRANSACTIONS B
0011
I$.OKU
.... '?! ::
X1,80e
:?~:
IBCm
"2
:-
i
i Fig. 6--Micrographs of electron microprobe analysis of the interface in TiC-coated SCS-6 fiber-reinforced Ti-6A1-4V + 2 wt pct C matrix composite (TMC
Data Loading...
