王海
,
魏芬绒
,
崔文俊
,
樊亚军
,
邵晖
,
李雷
材料热处理学报
实验用TC4ELI铸锭,经过开坯、锻造、轧制为φ18 mm的棒材,轧制变形量为91.6％;轧制后进行淬火,淬火温度为830℃,最后对淬火后材料进行温度为650℃、750℃,时间为lh、2h的热处理实验.结果表明:淬火后TC4ELI钛合金的抗拉强度最高,达到1064 MPa,此时材料的屈强比只有0.79.XRD结果表明,淬火后β相发生了马氏体转变,提高了材料的强度;在拉伸过程中,亚稳定的转变组织由于应变引起的转变,使材料均匀伸长率提高,增大了抗拉强度与屈服强度的比值.采用轧制(变形量为91.6％)+淬火(830℃)+650℃×lh的形变热处理工艺后材料的抗拉强度和屈强比分别为1017 MPa和0.94,伸长率为17.5％,综合性能优异.
关键词:
TC4钛合金
,
超低间隙
,
形变热处理
,
屈强比
J.G WanG
,
L.C Zhang
,
G.L. Chenand HQ. Ye(State Key Laboratory for Advanced Metals and Materials
,
Unborsity of Science and Technology Beijing
,
Beijing 100083
,
China)(Laboratory of Atond Imaging of Solids
,
Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)
金属学报(英文版)
The dislocation ledges at the α2/7 intedece in a hot-dejormed Ti-45Al-10N alloywere analyzed by high-resolution tmnsmission electron microscopy. A new type ofdislocation ledge containing 1/3[111] Frank partial was found. The height of the ledgestDas always three [111]γplanes. The Burpers vectore of these diBlocation ledges weredetermined to be 1/2[110] and 1/2<101] corresponding to the 90 dey. and 30 deg.Shockley partials at noral ledges, i.e. 90 dep. ShockIey Partial dislocation +1/3[111]Frank partial dislocation; and 30 deg. Shockley partial dislocation + 1/3[111] Frankparfial dislocations. The jormation mechanism of this new tare of dislocation ledgewas discussed.
关键词:
titanium aluminide
,
null
,
null
,
null
