An awesome display of hitting by Ash Gardner and Grace Harris, plus a hat-trick from Heather Graham, has secured Australia a 4-1 series win in the T20 international series in India.

The duo smashed 129 in 10.2 overs in an unbeaten fifth-wicket partnership in Mumbai, providing the platform for an impressive 54-run win.

Their exploits even overshadowed a hat-trick by Graham, though that was also because six overs were bowled between second and third dismissals.

Australia, put into bat, racked up 4-196 off their 20 overs. In reply India could only muster 142, being all out off the final ball.

"I loved watching Ash and Grace today. We pride ourselves on fearless cricket, like to take the game on and stay ahead," Australia's stand-in captain Tahlia McGrath said.

As in the fourth match, Gardner was the all-round star also taking 2-20 and two catches.

"I think it's easy batting with someone like Grace, who has the power game to back up the chat," said Gardner.

The New South Welshwoman cracked 66 off 32 balls with 11 fours and a six. Queenslander Harris bludgeoned 64 off 35 with six fours and fours sixes, her highest T20I score.

Their onslaught put the game beyond an Indian team who lost world-ranked number three batter Smriti Mandhana for four in the first over after which wickets tumbled regularly. Harleen Deol (24 off 16 balls) got going but she was run out by McGrath.

Belated resistance came from Deepti Sharma, who snacked 53 off 34 balls before being last out, fittingly caught on the ropes by Gardner off Graham.

That gave Graham remarkable figures of four wickets for eight runs off two overs including a hat-trick taken off the last two balls of the 12th over and the first of the 19th.