Super-hard metal 'four times tougher than titanium'

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Super-hard metal 'four times tougher than titanium'

#1  Postby DougC » Jul 22, 2016 11:00 pm

B.B.C. Article
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 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.

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Re: Super-hard metal 'four times tougher than titanium'

#2  Postby thirsting » Jul 23, 2016 7:04 am

That's what Iron Man's armor is made of, at least in the first movie! Gold-titanium alloy. I knew it was a documentary :p
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Re: Super-hard metal 'four times tougher than titanium'

#3  Postby Calilasseia » Jul 23, 2016 2:33 pm

The full scientific paper is a free download from the journal here ...

High Hardness In The Biocompatible Intermetallic Compound βTi3Au by Eteri Svanidze, Tiglet Besara, M. Fevsi Ozaydin, Chandra Sekhar Tiwary, Jiakui K. Wang, Sruthi Radhakrishnan, Sendurai Mani, Yan Xin, Ke Han, Hong Liang, Theo Siegrist, Pulickel M. Ajayan & E. Morosan, Science Advances, 2(7): e1600319 (20th July 2016) DOI: 10.1126/sciadv.1600319

Svanidze et al, 2016 wrote:The search for new hard materials is often challenging, but strongly motivated by the vast application potential such materials hold. Ti3Au exhibits high hardness values (about four times those of pure Ti and most steel alloys), reduced coefficient of friction and wear rates, and biocompatibility, all of which are optimal traits for orthopedic, dental, and prosthetic applications. In addition, the ability of this compound to adhere to ceramic parts can reduce both the weight and the cost of medical components. The fourfold increase in the hardness of Ti3Au compared to other Ti–Au alloys and compounds can be attributed to the elevated valence electron density, the reduced bond length, and the pseudogap formation. Understanding the origin of hardness in this intermetallic compound provides an avenue toward designing superior biocompatible, hard materials.
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