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| 1 | Effect of grain size on α-variant selection in a ZrTiAlV alloy显示文摘Local crystallographic orientation characteristics of grains with different sizes in a ZrTiAlValloy after interrupted cooling from βphase region are investigated by electron backscatter diffraction(EBSD) technique. A statistical analysis of EBSD data shows that bigger parent β grains present weaker variant selection than smaller grains. The relevant influences are studied by comparing the nucleation behavior of grain boundary α(GBα) and succedent growth stage in varisized grains. In-depth analysis indicates that the deviation between pole of GBα and common pole of adjacent parent β grains is responsible for the smaller degree of variant selection inside the bigger parent β grains. The formation of more than one GBα type at the β/β grain boundary with common pole in bigger grains results in obstructing each other for these variants during the following growth stage, while only one type of GBα nucleate at the β/β grain boundary with common pole in smaller grains and it can freely grow into the interior of the grains, leading to stronger variant selection in smaller β grains. | LI FeiTao QIU Xi LIAO ZhongNi LUAN BaiFeng ZHANG XinYu LIU RiPing LIU Qing | 2019 | Science China(Technological Sciences)2019，62，6： | 1 |
| 2 | Shear transformation zone dependence of creep behaviors of amorphous phase in a CuZr-based bulk metallic glass composite显示文摘The creep behaviors of the amorphous phase in a CuZr-based bulk metallic glass composite(BMGC)are studied by nanoindentation.Samples fabricated via higher cooling rates are found to exhibit more prominent creep,but a smaller shear viscosity.The volume of the shear transformation zones(STZs)in the amorphous phase calculated based on a cooperative shear model increases with the cooling rate.The evolution of excess free volume created during creep deformation is clarified.A looser atomic arrangement leads to a larger STZ volume,thus facilitating creep deformation.This study gives a better understanding of the deformation behaviors of the amorphous phase in BMGCs. | JIANG SongShan GAN KeFu HUANG YongJiang XUE Peng SUN JianFei | 2020 | Science China(Technological Sciences)2020，63，8： | 0 |
| 3 | Misorientation characteristics and textural changes induced by dense twins in high-purity Ti sheet after small strain rolling显示文摘A high-purity Ti(HP-Ti)sheet was subjected to small strain rolling(10%reduction)with microstructural and textural characteristics examined by electron channeling contrast imaging and electron backscatter diffraction techniques.Particular attentions were paid to misorientation and textural changes aroused by twins in the rolled HP-Ti sheet.Results show that after the 10%rolling,almost all the prior equiaxed grains in the initial specimen are twinned,leading to remarkable grain refinement.The presence of two major misorientation angle peaks around 65°and 85°is ascribed to{11-22}<11-23>and{10-12}<10-11>twinning,respectively,and two minor peaks around 47°and 77°are due mainly to impingement of various variants of such twins.Distinct from earlier work,the small strain rolling is confirmed to be able to induce drastic textural changes in pure Ti sheets:largely reduced texture intensity and appearance of new textural components.This can essentially be attributed to enhanced twinning activity due to much lower impurity contents of the present material.Primary{11?22}twins are mainly responsible for the new textural component of c-axes aligned near the rolling direction with spread,while the component of caxes parallel to the normal direction is due to reorientation of secondary{10-12}twins.This study clearly demonstrates the capability of small strain rolling to effectively modify both microstructures and textures of the HP?Ti sheet and may shed some light on exploring feasible processings for such materials. | DAI JiaHong ZENG LingGuo LI ZhiJun CHAI LinJiang ZHENG ZhiYing WU Hao MURTY KL GUO Ning | 2019 | Science China(Technological Sciences)2019，62，11： | 0 |
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