Abstract：Pulse fusion-mass spectrometry/thermal conductivity was used to determine quantitatively argon content, argon release and argon macro segregation in titanium-based alloy. The results showed that: argon content was obviously different for different preparation technology; the increase of argon content did not influence the content of oxygen, nitrogen and hydrogen, which could be used for technology guidance; argon in the sample was released at low temperature and existed in the uncombined state. The micro state of argon in the sample was observed by time-of-flight secondary ion mass spectrometry. Tensile test was conducted on samples with 1 000 μg/g and below 1 μg/g argon at room temperature, 650 ℃ and 800 ℃ by mechanics instrument for contrast. It indicated that the mass fraction of argon in titanium-based powder metallurgical materials could be up to 0.0X%; macro segregation of argon in the sample was not severe, while micro segregation was severe within 100 μm×100 μm zone. Argon existed in the form of uncombined element in titanium-based alloy, causing pore defects which were harmful for the mechanical properties of the material.
