Grain-boundary contamination and ductility loss in boron-doped Ni 3 Al
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		    I.
 
 INTRODUCTION
 
 T H E ductility of Ni3AI alloys at elevated temperatures is greatly affected by test environments, such as vacuum and air, as well as vacuum quality. H 41 Our previous work cSl revealed that the ductility of Ni-23A1-0.5Hf0.2B (at. pct),* tensile tested at 1033 K under very care*All compositions are reported in atomic percent.
 
 fully controlled vacuum (		
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