中文摘要：

In order to study the relation between martensitic transformation temperature range ?T(where ?T is the difference between martensitic transformation start and finish temperature) and lattice distortion ratio(c/a) of martensitic transformation, a series of Ni46Mn28-xGa22Co4Cux(x = 2–5) Heusler alloys is prepared by arc melting method. The vibration sample magnetometer(VSM) experiment results show that ?T increases when x > 4 and decreases when x < 4 with x increasing,and the minimal ?T(about 1 K) is found at x = 4. Ambient X-ray diffraction(XRD) results show that ?T is proportional to c/a for non-modulated Ni46Mn28-xGa22Co4Cux(x = 2–5) martensites. The relation between ?T and c/a is in agreement with the analysis result obtained from crystal lattice mismatch model. About 1000-ppm strain is found for the sample at x = 4 when heating temperature increases from 323 K to 324 K. These properties, which allow a modulation of ?T and temperature-induced strain during martensitic transformation, suggest Ni46Mn24Ga22Co4Cu4can be a promising actuator and sensor.

英文摘要：

In order to study the relation between martensitic transformation temperature range AT （where AT is the difference between martensitic transformation start and finish temperature） and lattice distortion ratio （c/a） of martensitic transforma~ tion, a series of Ni46Mnz8_xGa22Co4Cux （x = 2-5） Heusler alloys is prepared by arc melting method. The vibration sample magnetometer （VSM） experiment results show that AT increases when x 〉 4 and decreases when x 〈 4 with x increasing, and the minimal AT （about 1 K） is found at x = 4. Ambient X-ray diffraction （XRD） results show that AT is proportional to c/a for non-modulated Ni46Mn28_xGa22Co4Cux （x = 2-5） martensites. The relation between AT and c/a is in agreement with the analysis result obtained from crystal lattice mismatch model. About 1000-ppm strain is found for the sample at x = 4 when heating temperature increases from 323 K to 324 K. These properties, which allow a modulation of AT and temperature-induced strain during martensitic transformation, suggest Ni46Mn24Ga22Co4Cu4 can be a promising actuator and sensor.