Liquid helium tensile test of metallic materials

The liquid helium tensile test of metal materials can measure the tensile properties of metal materials at the temperature of liquid helium (the boiling point is -269°C or 4.2K, designated as 4 K). Zhongke Testing and Reliability Experiment Center has the capabilities of environmental testing and reliability performance testing of various metal materials, and provides professional liquid helium tensile testing services for metal materials.

1. Ferrous metals: iron, copper, manganese and steel, etc.
2. Non-ferrous metals: tin alloy, aluminum alloy, magnesium alloy, copper alloy, aluminum alloy and zinc alloy, etc.

1. Apply tensile force to the sample at liquid helium temperature (-269 ℃ or 4 K), usually until it breaks, and measure one or several low-temperature mechanical properties.
2. During the liquid helium tensile test, the sample temperature cannot always be maintained at a constant value. Generally speaking, changing the mechanical test variables can change the type of sawtooth, but it cannot eliminate discontinuous yielding. At room temperature, the material deformation is close to isothermal, and discontinuous yielding generally does not occur.
Therefore, the tensile properties of materials in liquid helium (especially tensile strength, elongation after fracture and reduction of area) lack the usual meaning of room temperature performance measurement. The liquid helium tensile test first adopts strain rate control method A, followed by displacement control method B.

GB/T 228.4-2019 Metallic materials - Tensile testing Part 4: Liquid helium test method
ISO 6892-4 -2015 Metallic materials - Tensile testing Part 4: Liquid helium test method
BS ISO 6892-4-2015 Metallic materials - Tensile testing Part 4: Liquid helium test method
JIS Z2277-2000 Tensile test method for metallic materials in liquid helium