Both cases are examples of using the different different metallurgical characteristics of different metals.The coefficient of thermal expansion is very much different in each case and with each metal material.
Case #1: We have different materials bonded together that expand/contract at different rates. The expansion/contraction process is like a spring effect and will return the bimetal material to its original position after cooling down to original base temperature. Both metals were not stressed enough to go beyond the yield strength of each metal, thereby permitting the bimetal strip to return to the original position. Case #2: A very specialized metal that obviously has a radically high coefficient of thermal expansion whereby the force/stresses induced by thermal change are significantly strong enough to overcome the stress in the material that occurred by physically deforming, (yielding) and stretching/straightening the spring. There is enough of a force developed by thermal/chemical reactions to electricity/water to shrink/twist back the wire and return it to its spring like position. Metals that we see used in club manufacturing do not possess nearly the same magnitude of thermal expansion/contraction that is present in the metal of Case #2. What was shown was not metal memory but thermal/chemical/electrolytic reactions occurring in a very specialized metal. Frank Hann From: Art Woods Sent: Saturday, January 26, 2013 8:29 AM To: ShopTalk@mail.msen.com Subject: Re: ShopTalk: How to bend PING 17-4SS irons? Metal memory when bending irons.? http://www.youtube.com/watch?v=t4hfv1PeXRk ‘’Second myth is that after bending the irons will return to original angles due to the "memory" in the metal. DUH ! All irons I have bent seem to suffer from memory loss!’’ Yes or no. A No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2890 / Virus Database: 2639/6059 - Release Date: 01/26/13
