Hacker News Reader

Comment by filmgirlcw | Hacker News Reader

And Apple moved to using aluminum from titanium in its PowerBooks (the design would later be the basis of the original MacBook Pro), in part, because the softness of of the metal, led to warps and bends in those first-gen TiBook models. I don't know how Essential is using titanium, but history certainly has examples of gadgets that suffered from using that metal over others.

View on HN

...and if you believe that, I've got a bridge for sale. Titanium is many things but soft it is not. It can also be alloyed with many other metals for specific purposes. One thing it definitely is though is expensive which is most likely the reason for Apple to look for alternatives. That is actually is possible to use titanium to create form-stable notebooks can be seen by e.g. the many Thinkpads which sport titanium lids and frames. I have yet to see one of these warped or bent. This is partly due to the boxy - and with that, strong - form factor but the material plays a big role as well.

The failure mode I observed most frequently in the TiBooks case was the titanium would crack, particularly around the edges.

Thinkpads generally use magnesium frames, not titanium.

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/...

The T-series (at least from T2x to T6x) had titanium lids. I don't know what they use nowadays as I am in the habit of using older machines (currently using a T42p with 1600x1200 4:3 screen). The T21 I'm using as a mobile terminal to access headless servers has been used as a seat cushion more than once, the screen hasn't budged...

http://www.thinkwiki.org/wiki/ThinkPad_series

For anyone wanting to brighten their day with some thinkpads, it unfortunately looks like large chunks of magnesium are not flammable [1].

[1] http://www.fishercast.com/downloads/FisherCast_Magnesium_Whi...

No, Mg is used for alloyed aircraft wheels, so I'm sure its not like Mn.

Titanium is also a relatively poor conductor of heat. Aluminum conducts heat over 10 times better than Titanium. Use of aluminium would be much better at conducting heat away from the body of the notebook.

Ti is about 3x as hard as Al:

https://en.wikipedia.org/wiki/Hardnesses_of_the_elements_(da...

Not to mention, very few use pure titanium. Most use an alloy like 6al4v, which gives it the best of both worlds.

The Ti-Books had a lot of issues. The biggest one was broken hinges. There were a lot of physical problems with those machines that didn't manifest until after about a year's worth of use.

Too bad, they were really cool at the time they were introduced.

Reply on news.ycombinator.com