Hi Sylvain, You clearly need an alloy with a low modulus as well as high ductility—that eliminates most Pb-free solders, and eaves SnPb and some In-based alloys. Much will depend how these solder joints will be loaded in use. Fatigue behavior is per Coffin-Manson. Werner -----Original Message----- From: Sylvain Kaufmann <[log in to unmask]> To: [log in to unmask] Sent: Tue, Feb 22, 2011 5:35 am Subject: [TN] Dear Technetters, I am looking for some information about solder joints / alloy behavior in extremely low temperature environment; in this particular case, for temperatures below 77K. I have not been very lucky so far and could not find any useful data or papers. Do any of you have experience with such environment? Any alloy to suggest or to stay away from? Some literature or studies that would be available somewhere? Thanks in advance for your help and sharing your thoughts about that cold case. Best regards sylvain -------------------------------------------------------------------- Sylvain Kaufmann CERN / European Laboratory for Particle Physics Rte de Meyrin dpt. TE-MPE-EM 1211 Geneva 23 Tel: +41 22 767 37 02 Fax: +41 22 766 87 77 www.cern.ch -------------------------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------