摘要
通过机械合金化+热压烧结工艺制备了Cr-33.3Ta和Cr-26.6Ta-20Ti合金,研究了Ti对Laves相TaCr_2显微组织及断裂韧度的影响。结果表明,合金元素Ti会占据Laves相TaCr_2中Ta的位置。Cr、Ta和Ti元素混合粉末经球磨25h后仍未能合成金属间化合物,球磨后的混合粉末在1 350℃×1h热压烧结工艺下可获得高致密度合金。Cr-33.3Ta合金中添加20%的Ti会抑制C14结构的Laves相TaCr_2生成。与Cr-33.3Ta合金相比,添加20%的Ti时具有良好的合金化增韧效果,其断裂韧度从2.013 MPa·m^(1/2)提高至4.066 MPa·m^(1/2),维氏硬度也有所提高,为11.59GPa。
The Cr-33.3Ta and Cr-26.6Ta-20Ti alloys were fabricated by mechanical alloying and hotpressing sintering process. The influences of Ti addition on the microstructure and fracture toughness of TaCr2 alloys containing Laves phase were investigated. The results indicate that the alloying element Ti preferentially occupies the Ta site in the Laves phase TaCr2. Intermetallic compounds can＇t be synthesized by the blended Ta, Cr and Ti powders during the ball-milling for 25 h. The highly dense alloys were prepared from the ball-milled blended powders by the hot-pressing process at 1 350 C for 1 h The Cr-33.3Ta alloy with an addition of 20% 的 Ti （in atom） can inhibit the generation of Laves phase TaCr2 with a C14 structure. Compared to the unalloyed Cr-33.3Ta alloy, the fracture toughness value of the Cr-26.6Ta-20Ti alloy is increased from 2.013 MPa·m^1/2 to 4.066 MPa·m^1/2,exhibiting desirable alloying toughening effect. Meanwhile, the Vicker＇s hardness is also increased up to 11.59 GPa.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第1期71-74,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51161020)
航空科学基金资助项目(2015ZF56024)
江西省金属材料微结构调控重点实验室资助项目(南昌航空大学
JW201423001)
