Negative thermal expansion (NTE) materials, the volume of a material abnormally contract with the increase of temperature, is closed related to the magnetovolume effect (MVE) in magnetic materials. However, due to the limited knowledge of the mechanism for MVE, the progress of searching for new NTE metallic materials with excellent performance is quite slow. Here, we found enhanced MVE and abnormal thermal expansion in cubic Cr with little Fe substitutions for Cr. Due to the simple crystal structure and binary composition, Cr-Fe alloys is a favorable example to investigate the mechanism of MVE and NTE for many other metallic materials. In this study, we intend to determine the detailed magnetic and crystal structure for Cr-Fe alloy by long-wave length in-situ neutron powder diffraction experiments, which could help to give new insight into the mechanism of MVE in metallic materials.