Deformation of semi-solid Sn-15 Pct Pb alloy
- PDF / 1,462,113 Bytes
- 11 Pages / 594 x 774 pts Page_size
- 84 Downloads / 218 Views
compression such as the one shown schematically in Fig. 2(b). Devices employing this geometry have been used previously for quality control tests on materials such as asphalts and rubbers and in studying the deformation behavior of many plastics and polymers) ~ Since the test resembles closely an open die-forging operation, it also provides useful engineering information on the deformability of partially solid alloys. EXPERIMENTAL PROCEDURE Figure 3 is a schematic diagram of the compression apparatus used in this investigation. The compression plates are located in the center of a hollow stainless steel furnace (30 cm long, 3.75 cm diam, 1.6 mm wall thickness), open at both ends. Power is supplied by four 200 W bandheaters spaced evenly along the furnace tube and the entire assembly is heavily insulated. The two compression plates are made of stainless steel disks, 12.5 mm thick, accurately machined to provide a diametral clearance of approximately 13 thousandths of a centimeter (0.005 in.) between the plates and the furnace tube. A linear voltage displacement transducer is used to obtain the displacement as a function of time during compression. The output voltage of the transducer is continuously recorded on a strip chart recorder. Four chromel-alumel thermocouples are used to assure temperature uniformity in the test specimen. Two are embedded in the bottom plate, about 1.5 mm from the compression face, one in the top plate, 1.5 mm from the compression face, and one in a small hole drilled through the center of the top plate. This last thermocouple is almost in direct contact with the metal. One thermocouple, placed along the shaft attached to the top plate, serves as the control thermocouple, in conjunction with a solid-state temperature controller, to regulate the heat input to the furnace. Temperature uniformity in the test specimen is further aided by small
ISSN 0360-2133/80/1211-1927500.75/0 METALLURGICAL TRANSACTIONS A 9 1980 AMERICAN SOCIETY FOR METALS AND THE METALLURGICAL SOCIETY OF AIME
VOLUME 11A, DECEMBER 1980--1927
heating coils wound around the stainless steel shafts attached to the compression plates. Adjustment of the heat input to these coils made it possible to maintain the temperature in the region between the two compression
7o
,
[
,ot l i
l
to
,
Sn-15 % Pb
l
CONTINUOUSLY
I t
,
l
~/
/
/
COOLED
230 see-I
50
-i ,,o/
plates to within _+ 1 ~ throughout a test. In experiments conducted at the lower fractions solid (
Data Loading...
