The influence of Cr doping for Mn on the structural, martensitic transformation and mechanical properties of Ni₄₃Co₅Mn_44-xCr_xSn₈ (x = 0, 1.5, 3, 5, 6 and 6.5) alloys has been systematically investigated. The replacement of Mn by Cr changed the alloy microstructure from a single-phase martensite to a refined eutectic dual-phase microstructure consisting of a martensitic/austenitic matrix and a γ phase. The volume fraction of the γ phase increased progressively with increasing the Cr doping. The γ phase formation altered the composition and e/a ratio of the matrix phase. As a result, the martensitic temperatures and the entropy change of the transformation showed a decrease in these alloys. The Cr-doped eutectic Ni–Co–Mn–Sn alloy exhibited superior mechanical properties attributed to the well dispersed γ phase lamellar grains for effective crack retardation while retaining the metamagnetic phase transformation. The compressive strength and ductility of alloys are notably enhanced from 290 MPa to 1420 MPa and from 6.7% to 15.8% respectively with Cr doping from 0 at% to 6.5 at%.

Cr掺杂Mn对Ni ₄₃ Co ₅ Mn _44-x Cr _x Sn ₈的结构，马氏体转变和力学性能的影响（x = 0、1.5、3、5、6和6.5）合金已得到系统研究。用Cr替代Mn可以使合金的组织从单相马氏体变为由马氏体/奥氏体基体和γ相组成的细化共晶双相组织。γ相的体积分数随Cr掺杂的增加而逐渐增加。γ相的形成改变了基体相的组成和e / a比。结果，这些合金的马氏体温度和转变的熵变显示降低。Cr掺杂的共晶Ni-Co-Mn-Sn合金具有优异的机械性能，这归因于γ相层状晶粒分散良好，可以有效地延缓裂纹，同时保留了亚磁相变。