A Super-hard Metal 'four Times Tougher Than Titanium' Has Been Discovered.

A super-hard metal has been made in the laboratory by melting together titanium and gold.

The alloy is the hardest known metallic substance compatible with living tissues, say US physicists.

The material is four times harder than pure titanium and has applications in making... read more longer-lasting medical implants, they say.

Conventional knee and hip implants have to be replaced after about 10 years due to wear and tear.

Details of the new metal - an alloy of gold and titanium - are revealed in the journal, Science Advances. Learn more about it here- http://www.bbc.com/news/science-environment-36855705

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