Talk:Titanium alloys

Need to figure out how to fix reference and add external links. It's a bit messed up. Need to add this link as it's a great reference: http://www.tifab.com/subpages/tech_spec_grades.htm War (talk) 08:41, 17 February 2008 (UTC)

Idle curiosity here.....grade 38 would be best for a suit of armor, correct? —Preceding unsigned comment added by 99.242.210.65 (talk) 19:17, 17 April 2009 (UTC)

Alpha and beta phases
Alpha and beta are just names given to various lattice structures of the material by material scientists. See titanium for explanations. Wizard191 (talk) 15:26, 11 August 2009 (UTC)

ASTM B861 - 10 Standard Specification for Titanium and Titanium Alloy Seamless Pipe
From the abstract of ASTM B861 - 10 at http://www.astm.org/Standards/B861.htm: "This specification covers the requirements for 34 grades of titanium and titanium alloy seamless pipe intended for general corrosion resisting and elevated temperature service."

In other words, ASTM B861 - 10 covers only part of the many tungsten alloys used. Further, ASTM B861 - 10 does not include a Grade 6 for titanium, despite the fact that it appears in the article in the list of grades as if it does. Importantly, ASTM B861 - 10 does provide useful and important information about Grades 1 to 5 that the article glosses over completely.

Next, Ti6Al4V alloy contains cytotoxic vanadium. Currently, the article asserts:

"Consequently, it is used extensively in aerospace, medical, marine, and chemical processing[7]"

Contrary to the assertion in the article, however, reference #7, itself citing the Titanium Information Group, given in support of the Wikipedia assertion makes no mention of its use in the medical industry. This is what the text of the reference states:

"This alpha-beta alloy is the workhorse alloy of the titanium industry. The alloy is fully heat treatable in section sizes up to 15mm and is used up to approximately 400°C (750°F). Since it is the most commonly used alloy – over 70% of all alloy grades melted are a sub-grade of Ti6Al4V, its uses span many aerospace airframe and engine component uses and also major non-aerospace applications in the marine, offshore and power generation industries in particular."

and

"Applications"

"As mentioned previously, this alloy is the most popular of the titanium alloys. It is used for a range of applications in the aerospace, marine, power generation and offshore industries."

Reference #5 does support the assertion of medical use of Ti6Al4V (Ti-6Al-4V) alloy, albeit with strong qualifications, in stating:

"Biocompatibility: Excellent, especially when direct contact with tissue or bone is required. Ti-6Al-4V's poor shear strength makes it undesirable for bone screws or plates. It also has poor surface wear properties and tends to seize when in sliding contact with itself and other metals. Surface treatments such as nitriding and oxidizing can improve the surface wear properties."

Because of concerns about the toxicity of the vanadium in Ti6Al4V (Ti-6Al-4V) alloy, Ti6Al7Nb (Ti-6Al-7Nb) alloy that replaced the vanadium with niobium was developed. See below 124.185.220.236 (talk) 18:09, 7 September 2012 (UTC)

Ti-6Al-7Nb titanium ally
Ti-6Al-7Nb is widely used in dentistry, in hip implants, and generally in human and in non-human animal medicine. Ti-6Al-7Nb was developed as a replacement for Ti-6Al-4V alloy because Ti-6Al-4V alloy contains cytotoxic vanadium. See page 1 of "The fatigue resistance of commercially pure titanium(grade II), titanium alloy (Ti6Al7Nb) and conventional cobalt-chromium cast clasps" (Inaugural-Dissertation zur Erlangung des Doktorgrades der Zahnheilkunde der Medizinschen Fakultät der Eberhard-Karls-Universität zu Tübingenvorgelegt von Mali Palanuwech, geb. 28.02.1974 aus München 2003).124.185.220.236 (talk) 18:09, 7 September 2012 (UTC)

External links modified
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Grade Four Titanium
There is a lengthy discusion of most of the ASTM titanium grades, but grade 4 (the second most common of the commerically pure titiamium grades, and a very common one at that) is missing. I don't know enough to fix this, but I feel it is important it is. Yellowy cake (talk) 21:32, 6 August 2018 (UTC)

Titanium steel
Should we discuss titanium steel here (What the heck is titanium steel)?Eaberry (talk) 07:36, 2 August 2021 (UTC)

Causal relation of thermal expansion coef. and high temperature durability?
The intro asserts that titanium allows have "a low thermal expansion coefficient, which means they can withstand extreme temperatures". Although they do have both properties, the causal relationship seem very dubious. Can some material scientist out there verify that one way or the other? BMJ-pdx (talk) 19:08, 30 June 2022 (UTC)

Discuss the structure of titanium and its alloys?
Discuss the structure of titanium and its alloys? 61.1.174.225 (talk) 06:49, 29 December 2022 (UTC)