BS ISO 6892-4:2015规定了液态氦中金属材料的拉伸试验方法 （沸点为-269°C或4,2 K，指定为4 K）并定义了 可以确定。ISO 6892的本部分也适用于低温（低于-196°C或 77 K），这需要特殊的仪器、较小的试件，并考虑锯齿屈服、绝热 加热和应变速率效应。根据ISO 6892的本部分，在4K下进行拉伸试验时，安装在低温恒温器中的试样 完全浸入液氦（He）中，并在标称应变速率下使用位移控制进行测试 10-3 s-1或更少。 注:稀有3He同位素的沸点为3,2 K。通常，测试在4He或混合物中进行 3He和4He的高浓度。因此，如前所述，温度为4K。交叉引用:ISO 6892-1ISO 6892-3ISO 7500-1ISO 9513ASTM E 1450JIS Z 2277购买本文件时可获得的所有当前修订版均包含在购买本文件中。

BS ISO 6892-4:2015 specifies the method of tensile testing of metallic materials in liquid helium (the boiling point is -269 °C or 4,2 K, designated as 4 K) and defines the mechanical properties that can be determined.This part of ISO 6892 may apply also to tensile testing at cryogenic temperatures (less than -196 °C or 77 K), which requires special apparatus, smaller test pieces, and concern for serrated yielding, adiabatic heating, 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 is fully submerged in liquid helium (He) and tested using displacement control at a nominal strain rate of 10-3 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 mixture of 3He and 4He with a high concentration of 4He. Therefore, the temperature is, as designated before, 4 K.Cross References:ISO 6892-1ISO 6892-3ISO 7500-1ISO 9513ASTM E 1450JIS Z 2277All current amendments available at time of purchase are included with the purchase of this document.