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| EFFECTS OF HIP AND HEAT TREATMENT ON MICROSTRUCTURE AND COMPRESSIVE PROPERTIES OF RAPIDLY SOLIDIFIED NiAl-Cr(Mo)-Hf EUTECTIC ALLOY |
| SHENG Liyuan; GUO Jianting; ZHANG Wei; XIE Yi; ZHOU Lanzhang; YE Hengqiang |
| Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
SHENG Liyuan GUO Jianting ZHANG Wei XIE Yi ZHOU Lanzhang YE Hengqiang. EFFECTS OF HIP AND HEAT TREATMENT ON MICROSTRUCTURE AND COMPRESSIVE PROPERTIES OF RAPIDLY SOLIDIFIED NiAl-Cr(Mo)-Hf EUTECTIC ALLOY. Acta Metall Sin, 2009, 45(9): 1025-1029.
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Abstract The NiAl-Cr(Mo) eutectic alloy has better fracture toughness and high temperature strength among NiAl alloys. Hf addition can raise the high temperature strength of NiAl-Cr(Mo) eutectic alloy further, but decreases its room temperature compressive properties obviously, which is caused by the microsegregation of Heusler phases. The NiAl-Cr(Mo)-0.5Hf alloy was rapidly solidified and then hot isostatic pressed (HIP) or high temperature treated (HTT) in order to improve the structure and property of this eutectic alloy. The results reveal that rapid solidification can well refine the microstructure of eutectic alloy and keep more amount of Hf solid solution phase in the alloy. Simultaneously, the shapes and distributions of the Heusler (Ni2AlHf) phases and Hf solid solution phases are well improved. After the HIP treatment, more Heusler phases are transformed into Hf solid solution phases, and the distributions of Heusler phases and Hf solid solution phases become homogeneous, and moreover the primary NiAl phases become coarsening obviously. After HTT, the amount of primary NiAl phases decreases a little, the Heusler phases and Hf solid solution phases become finer. The rapid solidification improves the room temperature compressive properties of the alloy significantly, the HIP and HTT improve its high temperature compressive properties further.
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Received: 03 December 2008
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