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Formation of adiabatic shear band and deformation mechanisms during warm compression of Ti–6Al–4V alloyJiao Luo,Lin-Feng Wang,Miao-Quan Li,Chang-Jian Ge,Xiao-Xiao Ma,Yong-Ting YangSchool of Materials Science and Engineering, Northwestern Polytechnical University摘 要:Adiabatic shear band(ASB) was narrow region where softening occurred and concentrated......
heating occurs in highly localized shear bands. Local adiabatic heating in the shear bands is thought to significantly reduce the glass viscosity by several orders of magnitude. The temperature... droplets besides well-developed vein patterns typical of bulk metallic glasses on the fracture surface, suggesting that localized melting induced by adiabatic heating may occur during the final failure......
; Microstructures of adiabatic shear bands formed by 90W-Ni-Fe alloy at strain of 0.6 图7 90W-Ni-Fe合金失效后的断裂路径观察 Fig. 7 Observation of fracture path of 90W-Ni-Fe alloy after failure 2.3 绝热剪切带内部...],通过式(4)计算剪切带内温升为1185 ℃,显然超过了钨的再结晶温度,在随后的冷却阶段,只需几微秒的时间,便可使动态再结晶后形成的微观结构得以保留. 图8 90W-Ni-Fe合金在应变速率6000 s-1/应变0.6 下绝热剪切带组织EBSD表征 Fig. 8 EBSD characterization of microstructure of adiabatic......
rotation and temperature rise inside the adiabatic shear band, the microstructural softening and thermal softening effects of typical heavily-deformed ? grains were successfully decoupled. The results...Multi-scale crystal plasticity ?nite element simulations of the microstructural evolution and formation mechanism of adiabatic shear bands in dual-phase Ti20C alloy under complex dynamic loadingYu......
considered turbulence, real gas effect and solid heat transfer issues. Through the numerical analysis method, the temperature distributions of the gas within the solid walls were revealed; adiabatic filling...Numerical analysis of temperature rise within 70 MPa composite hydrogen vehicle cylinder during fast refuelingWANG Liang(王亮)1, ZHENG Chuan-xiang(郑传祥)1, LI Rong(李蓉)1, CHEN Bing-bing(陈冰冰)2, WEI Zong......
, Hunan University, Changsha 410082, China)Abstract:Cu46Zr46Al4.8Ti3.2 bulk metallic glass (BMG) was successfully synthesized by copper-mold casting and the mechanical properties at room temperature were... the compression fracture strength. The different degrees of the adiabatic heating induce four types of fracture features: a vein-like structure, an elongated and striated vein pattern, melting......
=600 K,熔点Tm=1100 K,理论计算结果如图6所示. 图6剪切带内绝热温升ΔT与As/A,应变ε关系曲线 Fig. 6 Relationship curves of adiabatic temperature in shear band and strain as well as As/A 图7 试样断裂绝热温升ΔT与应变率的关系 Fig. 7 Relationship between adiabatic temperature in fracture specimen and strain rate 当试样最终断裂失效时,剪切带贯穿整个试样的横截面,这时As=A,σ=σf,ε=σf/E(E为弹性模量),这里考虑应变率效应,代入式中计算,其结果如图7所示.从计算结果可以得到,随着应变的增大,局部温升变化呈非线性增大趋势,说明随着弹性应变能的......
燃烧合成Al/Mg_2 Si复合材料的热力学分析 臧树俊1,孟倩1,安亮2,周琦1 (1.甘肃省有色金属新材料国家重点实验室,甘肃,兰州,730050;2.兰州工业高等专科学校交通工程系,甘肃,兰州,730050) 摘要:通过计算Al-Mg-Si体系的自由焓及绝热温度,对Al-Mg-Si体系反应中可能发生的反应进行了预测.结果表明,Al-Mg-Si体系在自蔓延反应条件下,只有Mg-Si之间能发生反应,当反应体系中有O_2存在时,有MgO生成,Al不能参与反应.通过实验成功地制备了Al/Mg_2Si复合材料,并验证了热力学分析结果. 关键词:燃烧合成; 热力学; 绝热温度; Al/Mg_2Si复合材料; combustion synthesis; thermodynamics; adiabatic temperature; Al/Mg_2Si composites; [全文内容......
自蔓延高温合成软磁铁氧体粉的研究进展 孟祥东1 (1.吉林师范大学物理学院,四平,136000;2.哈尔滨工业大学复合材料与结构研究所,哈尔滨,150001) 摘要:简要介绍了自蔓延高温合成技术和热力学判据,评论了此合成技术的新进展和存在的问题,综述了利用此方法制备MnZn,NiZn和MgZn铁氧体材料的制备工艺及其应用研究现状,重点分析讨论了软磁铁氧体的原料配方,合成工艺和磁特性.研究表明,通过控制工艺参数和添加剂的合理使用,SHS法制备铁氧体粉体具有更好的烧结活性和纯度,适合于大规模的工业生产. 关键词:自蔓延; 铁氧体; 绝热温度; self-propagating; ferrite; adiabatic temperature; [全文内容正在添加中] ......
transformation occurs in the shear band. The temperature in the shear band during the adiabatic shearing deformation is about 796 ℃. The phase transformation and the microstructure evolution process...晶；相变 中图分类号:TG 456.6 文献标识码:A Microstructure evolution in adiabatic shear band in titanium alloy TC16 WANG Bing-feng, YANG Yang (School of Materials Science......
