标准编号：ISO 6892-4:2015
中文名称：金属材料 拉伸试验 第4部分：液态试验方法
英文名称：Metallic materials — Tensile testing — Part 4: Method of test in liquid helium
发布日期：2015-10
标准范围
This part of ISO 6892 s pecifies t he m ethod o f t ensile t esting o f m etallic m aterials i n l iquid h elium(the boiling point is –269 °C or 4,2 K, designated as 4 K) and defines the mechanical properties thatcan be determined.This part of ISO 6892 may apply also to tensile testing at cryogenic temperatures (less than –196 °C or77 K), which requires special apparatus, smaller test pieces, and concern for serrated yielding, adiabaticheating, and strain-rate effects.To conduct a tensile test according to this part of ISO 6892 at 4 K, the test piece installed in a cryostat isfully submerged in liquid helium (He) and tested using displacement control at a nominal strain rate of10?3 s?1 or less.NOTE The boiling point of the rare 3He isotope is 3,2 K. Usually, the tests are performed in 4He or a mixtureof 3He and 4He with a high concentration of 4He. Therefore, the temperature is, as designated before, 4 K.
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