Graded Series of Nickel-Manganese Alloys. 11 



in the quenched condition for five months and then retested, 

 when it was found that no alteration had taken place in its 

 magnetic properties. Reannealing at 900° C. resulted in 

 its being restored to the condition which is characteristic of 

 the material in the freshly annealed condition. 



In Tables V. and VI. and PI. I. tigs. 5 and 6, are shown 

 the results obtained on testing specimens containing 25 per 

 cent. Mn and 30 per cent. Mn respectively. These materials 

 are, comparatively speaking, weakly magnetic. The mag- 

 netization curves for these specimens are very similar in 



Table V. — Nickel-Manganese Specimen ; 25 per cent. Mn. 



Value 

 of 

 H. 



o 

 10 

 15 

 20 



40 



60 



80 



100 



150 



200 



Specimen as cast. 



Specimen after annealing 

 from 900° C. 



*=i6°c.i *=-i<jo°c. !; ^=16° c.| t-. 



4 



9 



15 



21 



45 



61 



74 



85 



107 



120 



K. 



I. 



0-80 



6 



090 



16 



1-00 



-7 



1-05 



39 



1-12 



76 



101 



106 



093 



130 



0-85 



149 



0-71 



186 



060 



214 



K. 



120 

 1-60 

 1-80 

 1-95 

 190 

 T77 

 1-62 

 1-49 

 1-24 

 107 



6 



12 



18 



28 



58 



80 



96 



109 



131 



147 



K. 



1-20 

 1-20 

 1-20 

 1-40 

 1-45 

 1-33 

 1-20 

 1-09 

 88 

 0-73 



190° C. 



I. 



10 



24 



38 



51 



94 



130 



156 



180 



217 



247 



K. 



2 00 

 2 40 

 2 52 

 2"55 

 2-35 

 2-16 

 1 95 

 180 

 1-45 

 1-23 



Specimen after quench- 

 ing at 900° C. 



* = 16°C. f. 



190° C. 



6 

 10 

 13 

 29 



40 

 50 

 56 



70 



61 



K. 



0-60 

 060 

 0-06 

 005 

 0-72 

 0-66 

 062 

 056 

 0-46 

 0-40 



125 

 16 

 33 

 48 

 60 

 72 

 94 

 114 



080 

 0-80 

 083 

 080 

 083 

 0-80 

 0-75 

 072 

 0-63 

 0-57 



Table VI. — Nickel-Manganese Specimen; 30 per cent. Mn. 



Value 

 of 

 H. 



5 



10 



15 



20 



40 



60 



80 



100 



150 



200 



Specimen as cast. 



Specimen after annealing 

 from 900° C. 



* = 16°C. 



I. K. 



2 0-40 



4 040 



7 0-46 



9 0-45 



28 0-10 



46 0-77 



61 0-77 



74 0-74 



102 0-68 



121 062 



Specimen after quench- 

 ing at 900° C. 



]90°C. *=16°C. *=-190° C. / = 16°C 



I. 



3 



6 



10 



13 



32 



51 



67 



81 



111 



134 



K. 



0-60 

 0-60 

 0-66 

 0-65 

 080 

 0-85 

 0-84 

 0-81 

 0-75 

 067 



o 

 4 

 7 



11 

 30 

 48 

 67 

 81 

 112 

 135 



X. 



I. 



0-40 



3 



0-40 



6 



47 



10 



0o5 



14 



0-75 



35 



0-80 



54 



084 



72 



081 



89 



0-75 



123 



067 



152 



060 

 0-60 

 0-66 

 0-70 

 0-87 

 0-90 

 0-90 

 089 

 0-82 

 076 



I. 



K. 



1 



020 



3 



030 



4 



027 



6 



0-30 



16 



40 



27 



045 



36 



045 



43 



43 



57 



0-38 



68 



0-34 



z*=-190°C. 



1 

 3 

 4 



7 

 17 

 29 

 39 

 46 

 61 



020 

 030 

 0-27 

 0-35 

 043 

 048 

 49 

 046 

 041 

 036 



