Microstructure and mechanical properties of (Al,Cr)3Ti based alloy with different Al additions
Microstructure and mechanical properties of (Al,Cr)3Ti based alloy with different Al additions
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DOI：
10.1016/j.matdes.2008.05.011
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发表时间：
2009-03
影响因子：
8.4
通讯作者：
Shouren Wang;P. Guo;Liying Yang;Fang Zhao;Yanjun Wang
中科院分区：
文献类型：
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作者：
Shouren Wang;P. Guo;Liying Yang;Fang Zhao;Yanjun Wang
采用机械合金化和退火工艺形成具有立方L12有序结构特征的Al67Ti25Cr8粉末。通过热等静压制备 X% Al-Al67Ti25Cr8 复合材料（X=5、10、15、20wt.%）。在相同的试验条件下，随着Al含量的增加，块状试样的孔隙率先减小后增加。 10wt.% Al-Al67Ti25Cr8复合材料表现出良好的致密性，而20wt.% Al-Al67Ti25Cr8复合材料由于Al的膨胀和收缩而呈现出蜂窝状结构。由于Al的添加堵塞了微孔和微裂纹，具有适当Al含量（10-15wt.%）的Al-Al67Ti25Cr8复合材料表现出更高的强度（0.2%YS为420MPa，UTS为469MPa）和断裂韧性（10.4MPam0.5）。然而，过高的Al添加量导致机械性能恶化。
Al67Ti25Cr8powders with cubic L12ordered structural characteristic are formed by mechanical alloying and annealing process. X% Al–Al67Ti25Cr8composites (X=5, 10, 15, 20wt.%) were fabricated by hot isostatic pressing. Porosity of bulk specimen, first decreases, and then increases with increasing Al content at same test conditions. The 10wt.% Al–Al67Ti25Cr8composite exhibited good compactibility, whilst the 20wt.% Al–Al67Ti25Cr8composite exhibited honeycomb-shaped structures due to the expanding and shrinkage of Al. Owing to Al additions jamming the micro-pores and micro-cracks, Al–Al67Ti25Cr8composites with suitable Al contents (10–15wt.%) exhibit improved strength (0.2%YS as 420MPa and UTS as 469MPa) and fracture toughness (10.4MPam0.5). However, too high Al additions caused the deterioration of mechanical properties.