由于α铀晶粒的各向异性,在辐照下燃料元件发生尺寸外形的变化。人们预期,如能得到具有理想的完全无序晶粒取向的多晶铀,将不会再有辐照长大问题的存在。近年来,人们一直是采用β处理的办法来消除由于在α相加工时产生的择尤取向。但是,有各种证据表明,β处理只能得到近似的混乱取向,并不能完全消除织构。因此经β处理的铀中的残余织构问题一 Due to the anisotropy of alpha-uranium grains, the shape change of the fuel element occurs under irradiation. It is expected that there will be no longer the problem of radiation and growth if polyunsaturated uranium is obtained with an ideal completely disordered grain orientation. In recent years, people have been using β treatment to eliminate due to the selectivity of the α-phase processing orientation. However, there is a variety of evidence that beta treatment can only give an approximate disorientation and does not completely eliminate the texture. Thus the residual texture in β-treated uranium is one of the problems