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VIII. The Constitution of the Alloys of Aluminium and Zinc. 



By WALTER ROSENHAIN, B.A., D.Sc., and SYDNEY L. ABCHBUTT, A.I.C., oj the 



National Physical 



by II. T. GLAZEUROOK, C.U., F.R.S. 



Received January 30, Read February 1C, 1911. 







[PLATES 5-7.] 



THE alloys of aluminium and zinc have been studied as regards their constitution by 

 HKYCIII K and NEVILLE,* SiiKPHKRD.t and EWEN and TURNER.! The present authors 

 having occasion to study these alloys from the point of view of their mechanical and 

 physical properties in a research carried out under the auspices of The Alloys 

 Research Committee of the Institution of Mechanical Engineers, began by accepting 

 the equilibrium diagram in which SHEPHERD had expressed the results of his 

 investigation. A few cooling-curves, however, which were taken in the first place 

 with the object of confirming SHEPHERD'S results, immediately showed that the 

 constitution of these alloys must be much more complex than had Ijeen supposed by 

 Smii'iir.Kh. It therefore seemed desirable to carry out a more complete investigation 

 on the constitution of these alloys, and the results of that investigation are presented 

 in the present paper. 



The materials used in the present investigation were : aluminium of a high degree 

 of purity, kindly presented by the British Aluminium Company, and a very pure 



* HEYCOCK and NEVILLE, "The Freezing-Points of Alloys containing Zinc and another Metal," ' Journ. 

 Chem. Soc.,' vol. 71, 1897, p. 389. 



t SHEPHERD, "Aluminium-Zinc Alloys," 'Journal of Physical Chemistry,' 1905, 9, p. 504. 



\ EWEN and TURNER, "Shrinkage of the Antimony-Lead Alloys," 'Institute- of Metals,' September, 

 1910. 



A brief preliminary account of some of the results of the present investigation has been given in the 

 'Annual Report of the National Physical Laboratory for 1909* (published March, 1910), and in a lecture 

 l>y W. KOSKMIAIN at the Royal Institution in June, 1910. 



VIM.. . . xi. A 178. -2 s 2 7.9.11 



