抄録
A high-temperature vacuum tensile-fatigue tester (vacuum pressure 10-5mmHg, testing temperature room Temp. -700°C, testing load 0-50kg, and load frequency 1-10sec-1) is constructed, and the high-temperature vacuum tensile-fatigue test of Cu-Al (5% Al) alloy is performed as a test of the tester.
The main remarkable points of the tester and the results of the test are as follows:
(1) By the use of vacuum bellows, a cyclic load can be applied to a specimen in the vacuum vessel of the tester.
(2) By radiation of heater around the specimen, the temperature can be raised to 700°C.
(3) Deformation to rupture increases in proportion to the increment of the cyclic load.
(4) As to the relation of the cyclic number to rupture N and the temperature T, (-d log N/dT) generally increases in proportion to the increment of the cyclic load and decreases in proportion to the increment of the temperature.
(5) Short slip lines appear below about 400°C, and the length of these line and the deformation, made by those slip, to rupture are proportionally large to the increment of the temperature.
(6) Large slip lines appear above about 400°C, and the space between those lines is constant. Considerable deformation is caused by those slips to rupture.
(7) [cyclic number/cyclic number to rupture] n-[deformation/deformation to rupture] ε curve coincides with a curve ε(n) ε=0.132·n-1/3·exp(2.03n).
