Effects of variations in phosphorus content of electroless nickel from 4.6 to 9.4 w/o on structure, strength, ductility, and hardness were studied. Electron diffraction proved the crystallinity of many as‐plated alloys, and x‐ray data established a conventional precipitation hardening mechanism during heat treatment. Changes in properties after heat treatment at 200°–750°C have been correlated with structural changes shown by x‐ray diffraction and with those revealed in optical and electron back scatter micrographs. Abrupt changes in the structure, strength, and ductility of as‐plated alloys and of alloys heat treated at 750°C occurred at phosphorus contents of about 7%.
Experimental techniques and calculations for the determination of elastic modulus and internal friction from sonic measurements on thin‐walled tubes prepared by electrodeposition are described. A method of making the tubes with the necessary precision is presented. Data on the effects of some plating variables are given, but special attention is devoted to relationships between the structures of the deposits and the elastic properties under study.
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