研究了含氢最为0.16,0.58,0.87,1.49wt—％的Ti—6Al—4V—H合金中出现的各种氢化物,结果表明:氢超过0.58％时,合金中已有Ti_3Al相析出,同时,随着氢含量的增加,氢化物的形态逐渐由低氢的粗板条变到高氢的窄板条,后者组织明显细化,在含氢1.49％的试样中,还观察到四方点阵的氢化物和块状氢化物,并发现孪晶氢化物,根据孪晶氢化物的电子衍射花样的特点,可以简便地判别氢化物为立方或四方结构。
The microstructure and various hydrides precipitated in Ti--6Al--4V alloys con-taining hydrogen 0.16, 0.58, 0.87, 1.49 wt--%, respectively, have been studied by means of TEMand X--ray diffraction. The Ti_3Al phase may precipitate when [H] over 0.58 wt--%. In thesame time, the morphology of hydrides gradually changed from rugged sheets to narrow laths as[H] contents increased. The microstructure of highly H--doped alloys is obviously fine. A mas-sive hydride and the hydride with tetragonal lattice were observed in the specimen containing1.49 wt--% H. The twin hydrides were found in the alloys with different H contents and theelectron diffraction patterns of the twin hydrides can be served as a simple criterion for distin-guishing the cubic and tetragonal structures.
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