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				Cite this article: 
				 
					
			      No Author. . Acta Metall Sin, 1959, 4(2): 173-176.	
				  
				
				
					
						
							
								
									
									
									
									
									 
          
          
            
              
				
												  
													
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															    																	Received:  18 February 1959
																	    
															    															    															  
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															   [1] Рысина Н. С. и Б. Н. 1955.  [2] Nachtigall E., 1952, Zs. f. Metallkunde, 43, p. 23.  [3] Puch J. W., 1955, Transactions of American Society for Metals. 47, p. 984. | 
														   
																											 
									             
									           
             
			            			 
			
             
								                
															
																
																	
																																																																									
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