USA won't ever default so you will get money back at maturity date. But I will largely question the inflation at that point. If inflation goes significantly higher than the rate you are being paid it becomes self-destructive loop.
The USA could still choose to default, due to internal dysfunction.
US could choose defaulting as a better option to hyperinflation. It would lose all its credibility either way. The only thing it should do now is seriously jack interest rates, and maybe consider some austerity, but the working class is already at a breaking point and asking them to sacrifice even more for the billionaires isn't going to go over well politically (and the billionaires...).