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A new tensile device that would permit the insitu fracture and Auger electron spectroscopy (AES) examination of samples under well‐controlled, measurable test condition, was developed. Using this device, a sample can be fractured in ultrahigh vacuum AES chamber at a temperature between room and melting point temperature of the sample and at any cross‐heat speed (that is, tensile speed) between 3 cm/min and 300 cm/min. A sample is resistance heated by passing a current and therefore, heating rate is changed at any rate. The maximum heating rate is about 1000°C/s. In this system, an air pressure piston as the tensile device, is used, and then the tensile speed is easy to control by changing the flow of oil from the air pressure piston to the air changer. And also the system is designed so that the mechanical shock is absorbed when a specimen is fractured. It is very easy how to set a sample in this fracture device and to fracture it. It is possible to set three samples at one time. We can apply this device to the study of many metal failures which are controlled by time and temperature dependent mechanisms, such as creep rupture, temper embrittlement, weldability, and hot workability. In this paper, the new fracture device and its application to nickel‐base superalloy are described.

The design and operating characteristics of a unique reproducible linear, high‐density (≳1019e−/cm3), low‐temperature (17